How to Install Windows 11 From a USB Drive

What you need before you start

Installing Windows 11 from USB means you are replacing your current operating system with a fresh copy. This is different from updating — you will erase everything on your computer unless you back it up first. Before you touch anything, save your documents, photos, and files to an external drive or cloud storage. You will not be able to recover them once the installation begins.

You will need two things: a USB drive that is at least 8 GB in size (a 16 GB drive gives you more room to work with), and a second computer with internet access to read Windows 11 and create the installation USB. The computer you are installing onto must meet Windows 11's hardware requirements — an Intel processor from the 8th generation or newer, or an AMD Ryzen 2000 series or newer, plus at least 4 GB of RAM and 64 GB of storage space.

You also need a Windows 11 product key. If you are reinstalling on the same computer where Windows 11 was already activated, you may not need to enter it again — Windows can recognize the hardware. If this is a new installation on different hardware, you will need a valid key. Microsoft sells these through their website, or you may have one from a previous purchase.

Key Takeaways

Back up all your files before starting, because the installation will erase your entire hard drive.
read the Windows 11 installation tool on a different computer, then use it to create a bootable USB drive.
Insert the USB drive into the computer you want to install Windows on, restart it, and boot from the USB by pressing a specific key during startup (usually F12, Del, or Esc).
Follow the on-screen prompts to select your language, choose which drive to install to, and enter your product key when asked.
The installation takes 20 to 40 minutes, and your computer will restart several times during the process.

read the Windows 11 installation tool on a working computer

Go to Microsoft's Windows 11 read page on a computer that already has internet access and Windows (or another operating system). Click the button labeled "read now" under "Windows 11 Installation Media." This downloads a small program called the Windows 11 Media Creation Tool — it is about 20 MB and takes a minute or two.

Run the program once it finishes downloading. It will ask you to accept the license terms, then show you two options: "Upgrade this PC now" or "Create installation media for another PC." Choose the second option. Select "USB flash drive" when it asks what media you want to use. The tool will then read the full Windows 11 installation files — this is about 5 to 6 GB and may take 10 to 30 minutes depending on your internet speed.

When the read finishes, the tool will ask you to insert your USB drive. Plug it in, select it from the list, and click Next. The tool will format the drive (erase anything on it) and copy the Windows 11 files onto it. This takes another 10 to 20 minutes. When it says "Your USB flash drive is ready," you are done with this step.

Boot your computer from the USB drive

Take the USB drive to the computer where you want to install Windows 11. Shut down that computer completely — do not just put it to sleep. Plug the USB drive into any USB port on the front or back of the computer.

Turn the computer on. when ready start pressing a specific key repeatedly — the key depends on your computer's manufacturer. Common keys are F12, F2, Del, Esc, or F10. If you are not sure which one, look for a message on the screen during startup that says "Press [key] to enter Setup" or "Press [key] to choose boot device." You are looking for the boot menu, not the BIOS setup screen. If you miss the window and the computer boots normally into Windows, shut it down and try again.

When the boot menu appears, you will see a list of devices. Look for an entry that mentions your USB drive — it might say "USB Drive," "Removable Media," or the brand name of your USB drive. Select it and press Enter. The computer will boot from the USB, and the Windows 11 installation screen will appear in about 30 seconds.

Follow the installation prompts

The first screen asks for your language, time zone, and keyboard layout. Select the options that match where you are, then click Next. The next screen shows a button that says "Install now" — click it.

You will be asked to enter your Windows 11 product key. If you have one, type it in. If you do not have a key yet, click "I don't have a product key" — you can enter it later, and Windows will work in a limited mode until you do. Click Next.

The screen will show you the license agreement. Read it if you want to, then check the box that says you accept the terms and click Next. The next screen asks which type of installation you want: "Upgrade" or "Custom." Choose "Custom" because you are installing on a blank drive. If you were upgrading an existing Windows installation, you would choose "Upgrade," but that is not what we are doing here.

Select the drive and partition for installation

The installation tool will show you a list of drives and partitions on your computer. If this is a new computer or a drive you have wiped clean, you will see one entry that says something like "Drive 0 Unallocated Space" with a size in GB. Click on it to select it, then click Next. The installer will create the partitions it needs automatically.

If your computer has multiple drives or existing partitions, be careful here. The installer will erase whatever drive or partition you select. If you see multiple entries and you are not sure which one is the right drive, stop and check your computer's documentation or ask someone who knows your setup. Selecting the wrong drive will erase files you want to keep.

Once you have selected the correct drive, click Next. The installer will begin copying files and setting up Windows. This takes 20 to 40 minutes. Your computer will restart several times — this is normal. Do not unplug the USB drive or turn off the computer during this time.

Complete setup after installation finishes

When the file copying is done, the computer will restart and boot from the hard drive instead of the USB. You can remove the USB drive at this point. Windows will show you a setup screen asking for your region, keyboard layout, and network connection. Select your preferences and click Next.

You will be asked to sign in with a Microsoft account or create a local account. A Microsoft account lets you sync settings across devices and recover your account if you forget your password. A local account is simpler and keeps your data only on this computer. Choose whichever fits your needs.

Windows will then install drivers for your hardware and read updates. This can take 10 to 30 minutes depending on your internet speed and how many updates are available. Your computer may restart again during this time. When it finishes, you will see the Windows 11 desktop, and the installation is complete.

Troubleshooting common problems

If your computer does not boot from the USB, the most common reason is that you pressed the wrong key or missed the timing. Shut down the computer, plug the USB drive back in, and try again. If you still cannot get to the boot menu, check your computer's manual or search online for "[your computer model] boot from USB" to find the correct key for your specific hardware.

If the installation starts but fails partway through with an error message, the USB drive itself may be corrupted. Go back to the working computer, read the Windows 11 Media Creation Tool again, and create a new installation USB on a different drive. This usually fixes the problem.

If Windows installs but will not set up with your product key, make sure you are typing the key correctly — it is case-insensitive, but hyphens must be in the right places. If the key is correct and set up still fails, contact Microsoft support with your key and the error message you received. They can help you troubleshoot licensing issues.

Frequently Asked Questions

Can I use the same USB drive to install Windows on multiple computers?

Yes. Once you have created the installation USB, you can use it on as many computers as you want. Each installation will need its own product key to set up. The USB drive itself is just a copy of the installation files and does not get used up.

What happens to my files if I install Windows 11 this way?

Everything on your hard drive will be erased. This is why backing up your files before you start is critical. If you want to keep your old files, copy them to an external drive or cloud storage before you begin the installation.

Do I need internet during the installation?

You do not need internet while the files are being copied to your computer, but you will need it afterward to read drivers and updates. If your computer does not have built-in WiFi or Ethernet, you may need a USB network adapter or to connect to WiFi during the setup screens.

Can I go back to my old operating system after installing Windows 11?

Not unless you backed up your old drive before you started. The installation erases everything. If you want to keep the option to go back, create a full backup of your current hard drive before you begin, then store it on an external drive.

How long does the whole process take?

From start to finish, expect 1 to 2 hours. The actual file copying takes 20 to 40 minutes, but downloading the installation files on the first computer, creating the USB, and then completing setup on the target computer adds time. Plan for an afternoon if this is your first time.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.