How to Clean Install Windows 11 from USB: Complete Walkthrough

Written by the Softkeyworld technical team · Updated October 2026

A clean install is the most reliable way to give a PC a fresh start. It removes years of accumulated software, fixes stubborn corruption that repairs cannot reach, and is the right way to set up a new SSD or self-built system. It is also the point where most activation and boot problems begin, usually because of something missed in preparation. This walkthrough covers the full process from BIOS to desktop, including the choices in the current Windows 11 setup and the errors we most often help customers through.

This guide assumes you already have a bootable USB stick. If not, follow our step-by-step guide to creating a Windows 11 bootable USB with the Media Creation Tool or Rufus, then come back here.

Clean install vs reset vs in-place upgrade

Before you wipe anything, make sure a clean install is actually the right tool for the job.

Method	Keeps files	Keeps apps	Removes OEM bloat	Best for
Clean install from USB	No	No	Yes	New drives, new builds, deep corruption, selling a PC
Reset this PC	Optional	No	Not always	Quick refresh without external media
In-place repair (setup.exe from Windows)	Yes	Yes	No	Fixing system files without starting again

If you are moving from Windows 10 and want to keep everything, an in-place upgrade is usually the better route. We cover that in our guide to upgrading Windows 10 to 11 without losing files.

Step 1: Prepare before you wipe anything

1. Back up your data to an external drive or cloud storage, including Desktop, Documents, Downloads, browser profiles and any app data stored in %AppData%. Don't assume OneDrive has it all; check its settings to see which folders are actually backed up.
2. Check your licence. Open Settings > System > Activation. If it says Windows is activated with a digital licence linked to your Microsoft account, reactivation after the install is automatic. If you activated with a key, our guide to finding your Windows product key shows how to retrieve it.
3. Save your BitLocker recovery key if the drive is encrypted, in case anything prompts for it during the process.
4. Download the network and storage drivers for your model from the manufacturer's site and copy them to a second USB stick. Without a working network driver, setup cannot complete the online steps.
5. Note your edition. Check whether you have Home or Pro under Settings > System > About. Install the same edition.
6. Deauthorise software that limits activations (some creative and audio software does) so you do not lose a seat.

Step 2: Check the firmware settings

Windows 11 requires UEFI firmware that is Secure Boot capable, TPM 2.0, a compatible 64-bit CPU with two or more cores, 4 GB of RAM and 64 GB of storage. Microsoft lists the full set on its Windows 11 specifications page. Enter the BIOS/UEFI setup (usually Del, F2 or F10 at power-on) and confirm:

• Boot mode is UEFI, not Legacy or CSM.
• TPM is enabled. It is often labelled Intel PTT or AMD fTPM. Our guide to enabling TPM 2.0 in BIOS shows where to find it on the main brands.
• Secure Boot is available. It can be enabled before or after installation, but the firmware must support it.

If your PC fails these checks, read our explanation of the "This PC can't run Windows 11" error before you go further. We do not recommend registry or media modifications that skip the requirements. Unsupported installs are not entitled to updates and can stop working after a feature update.

Step 3: Boot from the USB

Plug the USB into a port directly on the motherboard (rear ports on a desktop) and use the one-time boot menu rather than changing the permanent boot order. Common keys are listed below; your manufacturer's manual is the final word.

Brand	Typical boot menu key
Dell, Lenovo (most)	F12
HP	F9 (or Esc, then F9)
ASUS	F8 or Esc
Acer	F12 (may need enabling in BIOS)
MSI	F11
Gigabyte	F12

Select the entry that starts with UEFI: followed by your USB stick's name. If you can already boot into Windows, you can also hold Shift while clicking Restart, then choose Use a device. When you see "Press any key to boot from CD or DVD", press a key.

Step 4: Run Windows Setup

Current Windows 11 media (24H2 and later) uses a redesigned setup interface. The steps are:

1. Choose your language, then your time and currency format and keyboard (United Kingdom for UK layouts) and click Next.
2. On Select setup option, choose Install Windows 11 and tick the box confirming that everything will be deleted. A Previous version of setup link is also available if you prefer the classic interface.
3. On the Product key screen, enter your 25-character key, or choose I don't have a product key if this PC was activated before. Its digital licence will apply once you are online.
4. If prompted, select the edition that matches your licence. A Pro key cannot activate Home, and a Home key cannot activate Pro.
5. Accept the licence terms.

Setup may skip the edition screen entirely. This happens when the PC has a key embedded in its firmware, as most laptops sold with Windows do, and setup installs that edition automatically. If you have bought a Pro licence for a machine that shipped with Home, install Home first and then upgrade from Settings, or use the edition change method described under Step 7.

Step 5: Partition the drive correctly

This screen deserves the most care. To avoid wiping the wrong disk, disconnect any other internal or external data drives before you start, if you can.

1. Identify the target disk by size, for example Disk 0. Each disk lists its partitions underneath.
2. Select each partition on that disk only (System, MSR, Primary, Recovery, OEM) and click Delete partition.
3. When the disk shows a single entry of Unallocated space, select it and click Next.

Do not create or format partitions yourself. Setup creates the EFI system partition, the Microsoft reserved partition, the Windows partition and the Recovery partition automatically, with the correct sizes and GPT layout for UEFI boot.

No drives shown?

On many recent Intel laptops, the NVMe drive sits behind Intel Volume Management Device (VMD) and is invisible to setup until you load the Intel Rapid Storage Technology driver. Click Load driver, browse to the second USB stick with the manufacturer's extracted RST/VMD driver, and select it. The drive then appears. Some machines also let you switch VMD off in the BIOS, but that can affect an existing installation, so load the driver instead where possible.

Step 6: Complete the out-of-box experience

Windows copies files and restarts several times. Remove the USB stick at the first restart if the PC keeps booting back into setup. Then the out-of-box experience (OOBE) begins:

1. Confirm your region and keyboard layout, and add a second layout if you need one.
2. Connect to a network. Microsoft states that Windows 11 Home and Windows 11 Pro for personal use require internet connectivity and a Microsoft account during initial setup. If Wi-Fi is not detected, plug in Ethernet or install the network driver from your second USB stick.
3. Name the device, or skip this and rename it later.
4. On Pro, choose Set up for personal use or Set up for work or school. The work option joins Microsoft Entra ID or prepares the PC for domain join by your IT team.
5. Sign in with your Microsoft account and create a Windows Hello PIN.
6. Choose whether to restore from a previous PC backup or set up as new. For a genuinely clean result, set up as new.
7. Review each privacy setting (location, diagnostics, tailored experiences) rather than accepting them all.

Step 7: Post-install checklist

• Activation: Open Settings > System > Activation. If it is not activated, enter your key through Change product key. If you replaced the motherboard, use the Activation troubleshooter; our guide to activation after a hardware change explains the process.
• Windows Update: Install all updates, including Optional updates for drivers, and restart until no more appear.
• Manufacturer drivers: Install chipset, graphics and any hotkey or audio packages from the vendor if Windows Update did not supply them. Check devmgmt.msc for devices marked with a yellow warning.
• Encryption: Check Settings > Privacy & security > Device encryption (or BitLocker on Pro). If it is on, confirm the recovery key has been saved to your Microsoft account.
• Restore point: Turn on System Protection for drive C: and create a restore point once everything works.

Common clean install errors and fixes

Error	Cause	Fix
"Windows cannot be installed to this disk. The selected disk is of the MBR partition style"	USB booted in UEFI mode, disk is MBR	Delete all partitions on the disk so setup creates GPT, or use diskpart (below)
0x80300024 "Windows cannot be installed to this drive"	Leftover partitions, wrong target disk or extra drives attached	Disconnect other drives and delete every partition on the target
0x8007025D during copying	Faulty USB stick or port, occasionally bad RAM	Recreate the media on another stick, use a rear port, test RAM
"This PC can't run Windows 11"	TPM or Secure Boot disabled, Legacy boot	Enable TPM/PTT and boot in UEFI mode
Boots back into setup repeatedly	USB still first in boot order	Remove the USB after the first restart

To wipe a disk from inside setup, press Shift + F10 to open a command prompt and run diskpart, then list disk, select disk 0 (check the number against the size), clean and convert gpt. Type exit twice, then click Refresh on the disk screen. The clean command destroys everything on the selected disk, so double-check that you have selected the right one.

Frequently asked questions

Do I need a product key to clean install Windows 11?

Not if the PC was previously activated on Windows 10 or 11. Choose "I don't have a product key" and the digital licence activates online. A new PC or new build needs a valid key.

Will a clean install remove my licence?

No. Digital licences are tied to your hardware and, if linked, your Microsoft account. Reinstalling the same edition on the same PC reactivates automatically.

How long does a clean install take?

On an SSD with a USB 3 stick, the copying stage typically takes 10–20 minutes. Updates and drivers afterwards can take longer than the installation itself.

Should I format the drive before installing?

No. Delete the partitions and let setup create its own layout. Formatting a single partition leaves the old recovery and EFI partitions behind.

Can I clean install Windows 11 on an unsupported PC?

Microsoft does not support it, and such devices are not guaranteed updates. We recommend enabling TPM and UEFI where the hardware allows, or replacing hardware that cannot meet the requirements.

Where should I download Windows 11?

Only from Microsoft's official Windows 11 download page. Modified ISOs from third-party sites are unsupported and can carry malware.

Our recommendation

Most clean installs that go wrong fail at the preparation stage, not during setup itself. Save your data, your BitLocker key and your network driver first, and the rest takes well under an hour. If you are installing on a new build or replacing an unlicensed system, a genuine Windows 11 Pro licence key is delivered by email instantly and activates during setup or afterwards from Settings.

Get Windows 11 Pro

Related reading

Resource	Why read it
Create a Windows 11 bootable USB	Make the install media this guide needs
Enable TPM 2.0 in BIOS	Pass the Windows 11 hardware check
Activation after a hardware change	Reactivate after a new motherboard