How to Install Windows 11 from a USB Drive (2026 Step-by-Step)
Installing Windows 11 from a USB drive gives you the cleanest, most reliable setup — perfect for a new PC build, a fresh start, or fixing a machine that won't upgrade normally. This guide walks you through it end to end, then shows how to activate with a genuine key.
Quick answer: Create a bootable USB with Microsoft's Media Creation Tool, boot your PC from that USB, follow the installer, then activate Windows 11 in Settings → System → Activation with your product key.
What you'll need
- A USB flash drive with at least 8 GB of space (it will be erased).
- A working PC to create the installer.
- Your Windows 11 product key (or a digital license linked to your Microsoft account).
- A PC that meets the Windows 11 system requirements (TPM 2.0, Secure Boot, 64-bit CPU).
Step 1 — Create a bootable USB
- Go to Microsoft's official Windows 11 download page.
- Download the Media Creation Tool and run it.
- Choose Create installation media (USB flash drive).
- Select your language and edition, pick your USB drive, and let it download and write the files.
The tool formats the drive and makes it bootable automatically — no extra software needed.
Step 2 — Boot your PC from the USB
- Plug the USB into the target PC and restart it.
- Open the boot menu (usually F12, F10, Esc, or Del — check your PC's splash screen).
- Select the USB drive from the list to boot from it.
- If it boots to Windows instead, enable UEFI boot and disable Fast Boot in BIOS, then retry.
Step 3 — Install Windows 11
- Choose your language and click Install now.
- When asked for a product key, you can enter it now or click "I don't have a product key" to activate later.
- Pick your edition (e.g. Windows 11 Pro).
- Choose Custom: Install Windows only for a clean install.
- Select the drive/partition and click Next. Windows copies files and restarts a few times.
- Complete the on-screen setup (region, account, privacy settings).
Step 4 — Activate Windows 11
- Open Settings → System → Activation.
- Click Change product key and enter your 25-character key.
- Windows verifies it with Microsoft and activates in seconds.
Need the full walkthrough with troubleshooting? See our Windows 11 activation guide.
Common issues
| Problem | Fix |
|---|---|
| USB won't boot | Enable UEFI, disable Secure Boot temporarily, recreate the USB |
| "This PC can't run Windows 11" | Enable TPM 2.0 and Secure Boot in BIOS |
| Key won't activate | Confirm the edition matches your key; see the activation guide |
| No drives shown at install | Load the storage driver, or switch SATA mode to AHCI in BIOS |
Frequently asked questions
Do I need a product key to install Windows 11 from USB? No — you can install without one and activate later. But you'll need a genuine key to unlock personalization and remove the "Activate Windows" watermark.
Will installing from USB delete my files? A Custom (clean) install erases the selected drive. Back up your files first. An in-place upgrade keeps files, but a clean install is more reliable.
Which edition should I install? Windows 11 Pro for BitLocker, Remote Desktop, and Hyper-V; Home for everyday use. You can upgrade Home to Pro later with a Pro key.
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