Back up your important files to an external drive or cloud storage
Check your Windows license and sign in details
Download the Windows installation media tool from Microsoft on another PC if needed
Create a bootable USB drive with at least 8 GB of space
Insert the USB drive into the PC you want to reinstall
Restart the PC and open the boot menu or BIOS/UEFI setup
Select the USB drive as the boot device
Choose your language, time, and keyboard settings
Click Install now
Enter your product key if prompted, or choose the option to do it later
Select the Windows edition that matches your license
Accept the license terms
Choose Custom: Install Windows only
Select the drive or partition where Windows is installed
Delete or format the Windows partition if you want a clean reinstall
Select the unallocated space or target partition and continue
Wait for Windows to copy files and restart
Complete the setup steps after installation
Reinstall drivers, updates, and applications
Restore your backed-up files