A clean install typically erases the disk partition(s) used for Windows and applications. Treat data on those partitions as gone unless you have verified backups you can restore from another device.
What you will achieve
A fresh Windows 11 install on your system drive, with updates and drivers applied, and a short verification pass so you know activation, network, and backups are sound.
Before you start
- Back up personal files to external storage or cloud you can access elsewhere — not only on the PC you are about to wipe.
- Export software licences and note apps that need manual reinstall (password managers, creative tools, VPN profiles).
- Download drivers from the PC or motherboard vendor if the machine has unusual Wi‑Fi/Ethernet hardware.
- Confirm policy on work or school PCs — managed devices may block clean installs or require re-enrolment.
- Locate your Windows licence — digital licence tied to hardware usually reactivates; OEM stickers or Microsoft account linkage help if activation fails.
1) Create Windows 11 installation media
- On a working PC, download Microsoft’s Windows 11 Installation Media tool or a verified ISO from Microsoft’s official site.
- Use an empty 8 GB or larger USB flash drive (contents will be erased).
- Create the USB, safely eject it, then label it clearly (machine name + date).
See our recovery USB guide if you want a dedicated walkthrough for media creation.
2) Boot from the USB installer
- Shut down the target PC completely (not sleep).
- Insert the USB and power on.
- Open the one-time boot menu — common keys: F12, F10, Esc, F2 (vendor-specific).
- Select the UEFI USB entry (often includes the stick brand name).
If the PC boots straight into the old Windows install, enter firmware setup (UEFI), temporarily set USB first in boot order, or disable Fast Boot if it skips the USB.
3) Custom install and disk layout
- Choose language and keyboard, then Install now.
- On the “Which type of installation?” screen, pick Custom: Install Windows only (advanced) — not Upgrade.
- In the disk list, identify the system disk by size and existing partition names.
- To wipe: delete existing Windows partitions on that disk until you see Unallocated space, select it, and let setup create required partitions automatically.
- With multiple physical disks, double-check you are modifying the correct disk before deleting anything.
Secondary data drives (D:, secondary NVMe) should remain untouched unless you intend to erase them. Deleting partitions in setup is immediate.
4) Out-of-box experience and updates
- Complete region, keyboard, network, and account steps. A local account may still be available via workarounds on some builds — Microsoft’s options change between releases.
- Open Settings → Windows Update and install all pending updates. Reboot and repeat until no critical updates remain.
- Open Device Manager — install missing chipset, storage, or network drivers from the vendor if yellow warning icons appear.
- Install essential applications and restore files from backup.
5) Verify the install
- Activation: Settings → System → Activation shows Windows is activated.
- Security: Windows Security reports real-time protection and firewall enabled.
- Network: Wi‑Fi/Ethernet stable; browse HTTPS sites without certificate warnings.
- Peripherals: Sound, Bluetooth, printer, external displays.
- Backup restore test: recover one important file from backup to prove restore works.