How to Download Windows 11 ISO to USB and Install It From Scratch

Building a new PC or replacing an old computer is exciting, but the first setup step can feel confusing if the system does not have Windows installed yet. The easiest and safest approach is to download Windows 11 to a USB flash drive, boot the new PC from that USB drive, and install Windows from scratch.

You do not need to buy a Windows DVD or use unofficial downloads. Microsoft provides an official Media Creation Tool that can download the latest Windows 11 version and turn a USB flash drive into bootable installation media. As of 2026, Microsoft’s download page lists Windows 11 version 25H2, also known as the Windows 11 2025 Update.

This guide explains how to download Windows 11 to a USB, how to boot from it, how to install Windows 11 on a new PC, what to do with product keys, and how to fix common installation problems.

What You Need Before Downloading Windows 11 to a USB

Before you start, make sure you have everything ready. Creating the Windows 11 USB is simple, but the USB drive will be erased during the process.

• A working Windows PC with a stable internet connection.
• A blank USB flash drive with at least 8GB of storage. A 16GB or 32GB USB drive is usually a better choice.
• Your new PC connected to a monitor, keyboard, mouse, power supply, and storage drive.
• A genuine Windows 11 product key, if your PC does not already have a digital license.
• Internet access for activation, updates, drivers, and initial setup.

Do not use a USB drive containing important files. The Media Creation Tool formats the drive, which permanently removes its existing content.

Windows 11 System Requirements for a New PC

Before creating the USB installer, confirm that your new PC meets the official Windows 11 requirements. Most modern laptops, prebuilt computers, and newly assembled desktops should meet them, but BIOS settings such as TPM and Secure Boot may need to be enabled manually.

• Processor: 1GHz or faster, with at least two cores, on a supported 64-bit processor.
• RAM: Minimum 4GB, although 8GB or more is strongly recommended.
• Storage: At least 64GB of available storage. For a smooth experience, use an SSD with 256GB or more.
• System firmware: UEFI firmware with Secure Boot capability.
• Security: TPM 2.0 support.
• Graphics: DirectX 12-compatible graphics with a WDDM 2.0 driver.
• Display: A 720p or higher display larger than 9 inches.
• Internet: Required during setup for Windows 11 Home and personal-use Windows 11 Pro setups.

Windows 11 is designed for newer hardware and security features. TPM 2.0 and Secure Boot help protect your system from certain boot-level malware, unauthorized firmware changes, and credential attacks.

Avoid unsupported installation bypasses on an older PC. Microsoft warns that unsupported devices may face compatibility problems and may not be entitled to updates. For a new PC, it is better to enable the required settings properly rather than bypassing them.

How To Download Windows 11 to a USB Drive

The official Microsoft Media Creation Tool is the best option for most people. It downloads the correct Windows 11 files and creates a bootable USB automatically, so you do not need to manually format drives or configure ISO files.

Step 1: Insert a Blank USB Drive

Insert your USB flash drive into a working Windows PC. It should have at least 8GB of available storage, but using a 16GB or 32GB drive gives you more flexibility.

Check the USB drive carefully before continuing. Any files on it will be deleted when Windows installation media is created.

Step 2: Go to the Official Windows 11 Download Page

Open your web browser and visit Microsoft’s official Windows 11 software download page. You will normally see three main download choices:

• Windows 11 Installation Assistant
• Create Windows 11 Installation Media
• Download Windows 11 Disk Image (ISO)

For installing Windows 11 on a new PC, choose Create Windows 11 Installation Media. The Installation Assistant is meant for upgrading the PC currently running Windows, while the ISO option is better for advanced users, virtual machines, or custom USB creation tools.

Step 3: Download the Windows 11 Media Creation Tool

Under the Create Windows 11 Installation Media section, click Download Now. Your browser will download the Media Creation Tool file.

Once downloaded, open the file. Windows may ask for administrator permission. Select Yes to allow the tool to make changes to the computer.

Step 4: Accept the License Terms

The Windows 11 Media Creation Tool will open and prepare a few files. Read the license terms, then click Accept to continue.

The tool may take a minute before moving to the next screen, especially on slower computers or internet connections.

Step 5: Select “Create Installation Media for Another PC”

When asked what you want to do, choose:

Create installation media for another PC

Then click Next. This option creates a USB installer that can boot a new desktop, laptop, or replacement PC.

Step 6: Choose Windows 11 Language and Architecture

The tool may automatically select the language currently used on the working PC. You can leave the recommended settings enabled if you want the same language.

For most new computers, choose:

• Language: Your preferred Windows language.
• Edition: Windows 11.
• Architecture: 64-bit (x64).

Most Intel and AMD desktop PCs use the 64-bit x64 option. Do not select a 32-bit architecture because Windows 11 does not support 32-bit processors.

Step 7: Select USB Flash Drive

On the “Choose which media to use” screen, select:

USB flash drive

Click Next, then choose your USB drive from the list. Double-check the drive letter and storage size before continuing so you do not accidentally erase the wrong external drive.

Step 8: Let the Tool Download and Create the Bootable USB

The Media Creation Tool will now download Windows 11 and copy the installation files to the USB drive. This may take some time depending on your internet speed and USB drive performance.

Do not remove the USB drive, shut down the computer, or close the Media Creation Tool while it is working. When the process finishes, you will see a message confirming that the USB flash drive is ready.

You now have a bootable Windows 11 USB installer.

How To Install Windows 11 on a New PC From USB

Once the USB is ready, connect it to the new PC. The next goal is to start the PC from the USB drive instead of the empty SSD or hard drive.

Step 1: Connect the Windows 11 USB to the New PC

Turn off the new computer completely. Insert the Windows 11 USB drive into a rear USB port if you are using a desktop PC. Rear motherboard USB ports are usually more reliable during installation than front-panel ports.

For laptops, use a direct USB port rather than a USB hub or docking station whenever possible.

Step 2: Enter the Boot Menu or BIOS

Turn on the new PC and immediately press the boot menu key repeatedly. The exact key depends on your motherboard or PC brand.

• ASUS: F8 or Esc
• MSI: F11
• Gigabyte: F12
• ASRock: F11
• Dell: F12
• HP: Esc or F9
• Lenovo: F12 or the Novo button
• Acer: F12

If the boot menu does not appear, restart the PC and try again. You may need to press Delete or F2 to enter BIOS or UEFI settings first.

Step 3: Select the USB Drive as the Boot Device

In the boot menu, select the USB drive. It may appear under the USB brand name, such as SanDisk, Kingston, Samsung, or Lexar.

Choose the entry that starts with UEFI: if you see two versions of the same USB drive. Windows 11 should be installed in UEFI mode for Secure Boot and modern partition support.

After selecting the USB drive, Windows Setup should load. You may see the Windows logo followed by the setup screen.

Step 4: Choose Language, Time, and Keyboard Settings

Windows Setup will ask you to select your language, time format, currency format, and keyboard layout.

Choose the settings you want, then click Next. On the next screen, select Install Windows 11.

Step 5: Enter Your Windows Product Key

You may be asked to enter a 25-character Windows product key. The product key usually looks like this:

XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

If you have a valid Windows 11 product key, enter it and continue. If you do not have one yet, select I don’t have a product key.

You can install Windows 11 without entering the key immediately, but the system will remain unactivated until you activate it later. Some personalization options may be limited until activation is complete.

Many branded laptops and prebuilt PCs store the Windows key in the motherboard firmware. In that case, Windows Setup may detect it automatically, and you may not see the product key screen.

Step 6: Select the Correct Windows Edition

If Windows asks you to choose an edition, select the one that matches your license.

• Windows 11 Home: Best for regular home users and most personal laptops or desktops.
• Windows 11 Pro: Better for business users, remote desktop hosting, BitLocker management, Hyper-V, and advanced networking features.

Do not install Windows 11 Pro if your license is for Windows 11 Home. Windows may not activate automatically if the installed edition does not match the license.

Step 7: Accept the License Terms

Read the applicable notices and license terms, then select Accept to continue.

Windows Setup will then ask where you want to install Windows 11.

How To Select the Correct Drive During Windows 11 Installation

This is the most important part of installing Windows 11 on a new PC. Choosing or deleting the wrong drive can erase important data, especially if you have multiple SSDs or hard drives connected.

Installing Windows 11 on a Brand-New SSD

If your PC has a completely new SSD with no previous data, you will usually see one entry such as:

Drive 0 Unallocated Space

Select that unallocated space and click Next. Windows will automatically create the required system partitions, including recovery, system, and primary partitions.

You do not need to create partitions manually unless you have a specific reason, such as keeping separate partitions for work files and Windows.

Installing Windows 11 on a Used Drive

If the SSD previously had Windows, Linux, or old files on it, you may see multiple partitions. For a fully clean Windows installation, delete the partitions only on the drive where you want to install Windows.

Keep deleting partitions on that specific drive until it shows only:

Drive 0 Unallocated Space

Select the unallocated space and click Next.

Important: Do not delete partitions from another drive unless you are completely sure that drive is empty or no longer needed. If possible, disconnect extra drives before installing Windows 11. This prevents accidental data loss and helps Windows place the boot files on the correct SSD.

Finish the Windows 11 Setup Process

After selecting the installation drive, Windows will copy files and restart the computer several times. This is normal.

Once the first restart begins, do not press the boot menu key again. Let the computer boot from the SSD instead of returning to the USB installer.

If the Windows installer starts again from the beginning, remove the USB drive after the first restart or change the boot order so the internal SSD is listed above the USB drive.

Connect to the Internet

During the first Windows 11 setup, connect to Wi-Fi or plug in an Ethernet cable. Windows 11 Home requires an internet connection and Microsoft account during initial setup. Personal-use Windows 11 Pro setups also generally require internet access and a Microsoft account.

Use Ethernet if possible. A wired connection is often easier during setup because Windows may not initially have the correct Wi-Fi driver for your motherboard or laptop wireless adapter.

Sign In With Your Microsoft Account

Sign in with your Microsoft account or create one during setup. This can help Windows restore your settings, sync OneDrive files, enable Microsoft Store access, and link your digital Windows license to your account.

Linking a digital license is useful if you reinstall Windows later or need to use the activation troubleshooter after a hardware change.

Choose Privacy and Device Settings

Windows will ask about privacy preferences, diagnostic data, location access, advertising ID settings, and optional personalization features. Read each option and select the settings you prefer.

There is no single correct choice. The best settings depend on whether you value convenience, privacy, device syncing, or personalized recommendations.

What To Do After Installing Windows 11 on a New PC

Windows may appear ready as soon as the desktop loads, but a few essential steps can improve performance, security, and hardware compatibility.

Run Windows Update Immediately

Open:

Settings > Windows Update

Select Check for updates and install all important updates. Windows Update may download security patches, driver updates, chipset files, display drivers, and optional hardware components.

Restart the computer whenever Windows asks you to do so. Then check for updates again until no important updates remain.

Install Motherboard and Graphics Drivers

Windows Update handles many drivers, but it may not always install the newest version. For a new custom-built desktop, visit the official support pages for your motherboard, graphics card, and processor platform.

Prioritize these drivers:

• Motherboard chipset driver
• Wi-Fi and Bluetooth driver
• Ethernet or LAN driver
• Audio driver
• Graphics driver from NVIDIA, AMD, or Intel
• Storage controller driver, if required

Installing the correct chipset driver helps Windows communicate properly with the motherboard, PCIe lanes, USB controllers, power management features, and storage hardware.

Check Windows Activation

Go to:

Settings > System > Activation

Check whether Windows says it is activated. If it is not, select the activation option and enter your product key.

If you have a digital license linked to your Microsoft account, Windows may activate automatically after connecting to the internet.

Set Up Security and Backups

Windows Security is built into Windows 11 and provides antivirus, firewall, ransomware protection options, and security alerts. Open Windows Security after setup and make sure there are no warnings.

You should also create a simple backup routine. Important files can be backed up to an external hard drive, OneDrive, Google Drive, or another trusted cloud storage service.

Common Problems When Installing Windows 11 From USB

USB Drive Does Not Appear in the Boot Menu

First, move the USB drive to another USB port. On a desktop PC, use a rear motherboard USB port instead of a front-panel port.

Then restart and check the boot menu again. If the USB still does not appear, recreate the installer using the official Media Creation Tool. The USB may not have been created correctly, or the flash drive may be faulty.

Windows Setup Says the PC Does Not Meet Requirements

This usually means TPM 2.0 or Secure Boot is disabled in BIOS or UEFI settings. Restart the computer, enter BIOS, and look for security settings.

Depending on your motherboard brand, TPM may appear as:

• Intel PTT on Intel systems
• AMD fTPM on AMD systems
• Trusted Computing
• Security Device Support

Enable TPM, switch the system to UEFI mode, disable Legacy Boot or CSM if necessary, and enable Secure Boot. Save the settings and restart the installation.

No Storage Drive Appears During Setup

If your new SSD does not appear on the Windows installation screen, first check whether it is detected in BIOS. For an M.2 SSD, make sure it is installed fully into the M.2 slot and secured with the correct screw.

For SATA SSDs, check both the SATA data cable and power cable. You may also need to update motherboard BIOS or load a storage controller driver from the motherboard manufacturer if your system uses a special RAID or Intel VMD configuration.

No Wi-Fi Option During Windows Setup

This usually happens when Windows does not include the correct driver for the new Wi-Fi adapter. Connect the PC with an Ethernet cable temporarily if possible.

After Windows is installed, download the official Wi-Fi driver from the motherboard or laptop manufacturer using another device, copy it to a USB drive, and install it manually.

Windows Keeps Returning to the USB Installer

Remove the USB drive after Windows copies files and restarts for the first time. If the issue continues, enter BIOS and make sure the internal SSD with Windows Boot Manager is set as the first boot device.

Frequently Asked Questions

Can I download Windows 11 to a USB for free?

Yes. You can download the official Windows 11 installation files and create a bootable USB for free using Microsoft’s Media Creation Tool. However, Windows still needs a valid product key or digital license for activation.

How large should a Windows 11 USB drive be?

Microsoft recommends a blank USB drive with at least 8GB of storage. A 16GB or 32GB USB drive is preferable because it gives you more room and is widely available.

Can I use the same Windows 11 USB on multiple PCs?

Yes. You can use the same bootable Windows 11 USB to install Windows on multiple compatible computers. Each PC still needs its own valid Windows license or digital entitlement for activation.

Do I need a product key before installing Windows 11?

No. You can select “I don’t have a product key” during setup and activate Windows later. However, install the edition that matches the license you plan to use, such as Windows 11 Home or Windows 11 Pro.

Should I use Windows 11 Home or Windows 11 Pro?

Windows 11 Home is enough for most personal users. Windows 11 Pro is better for users who need advanced features such as BitLocker management, Remote Desktop hosting, Hyper-V, Group Policy controls, and business-focused security tools.

Can I install Windows 11 on an old PC that does not support TPM 2.0?

It is not recommended. Unsupported installations can create stability, security, and update problems. Check your BIOS first because many newer Intel and AMD systems support TPM through Intel PTT or AMD fTPM, even when it is disabled by default.

Final Thoughts

Learning how to download Windows 11 to a USB and install it on a new PC is easier than it looks. The official Microsoft Media Creation Tool handles most of the work, including downloading Windows 11 and making the USB bootable.

The key steps are creating the USB on a working PC, booting the new computer in UEFI mode, selecting the correct SSD during setup, and completing Windows activation after installation. Once Windows Update and your essential drivers are installed, your new PC will be ready for work, gaming, browsing, and everything else you need.

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