You do not reinstall Windows 10 “from BIOS.” BIOS or UEFI firmware can be used to start the PC from bootable Windows installation media, and Windows Setup performs the installation. This process can erase files and applications, so back up important data before changing partitions or starting a clean installation.
Windows 10 Is No Longer in Ordinary Support
Support for standard Windows 10 version 22H2 ended on October 14, 2025, and Microsoft recommends Windows 11 for eligible PCs. Some Windows 10 devices can still receive updates through Extended Security Updates (ESU) or editions with different lifecycles, such as certain LTSC releases. Before reinstalling Windows 10, check the exact edition, licensing, and servicing status of the PC.
Before You Reinstall
- Back up all important files.
- Confirm the Windows edition currently licensed on the PC.
- Check activation status and legitimate license information.
- Prepare official Windows installation media appropriate for the system.
- Locate the BitLocker recovery key first if the drive is encrypted.
- Download important network or storage drivers from the PC manufacturer if the machine might need them during recovery.
Boot from the Windows USB Drive
- Connect the bootable Windows USB drive.
- Restart the PC.
- Open the manufacturer’s one-time boot menu or UEFI/BIOS setup using the documented startup key.
- Select the USB installation media using the appropriate UEFI boot entry.
- Save changes only if you changed firmware settings.
- Allow Windows Setup to start.
Prefer a one-time boot menu when available because it avoids permanently changing the boot order. Do not disable Secure Boot or change storage-controller modes merely because an old tutorial says to; those changes can create security or boot problems.
Install the Correct Windows Edition
Follow Windows Setup carefully. If the PC has a digital license for the same Windows edition, activation can occur after installation when the device goes online. Do not select a different edition unless you have a valid license for it.
Clean Installation Warning
Deleting or formatting partitions can permanently erase files and recovery data. If your goal is a true clean installation, identify the correct Windows system drive before making destructive changes. Stop if you are unsure which disk or partition contains the data you need.
After Installation
- Connect to the internet.
- Check Windows activation.
- Install available Windows updates and supported manufacturer drivers.
- Restore your files.
- Reinstall applications from trusted sources.
Summary
Use BIOS/UEFI or the one-time boot menu only to start the computer from official Windows installation media. Windows Setup performs the reinstall. Back up first, match the licensed edition, avoid unnecessary firmware changes, and remember that Windows 10 is already beyond ordinary support.