Download the Windows ISO from Microsoft
Insert a USB drive with at least 8 GB of space
Back up any important files on the USB drive
Create a bootable USB using the Windows Media Creation Tool or Rufus
Select the Windows ISO and the USB drive in the tool
Wait for the bootable USB creation to finish
Insert the USB into the target computer
Restart the computer
Enter the boot menu or BIOS/UEFI setup key during startup
Select the USB drive as the boot device
Save and exit if required
Follow the Windows setup prompts to install Windows
Choose language, time, and keyboard settings
Select Install Now
Enter a product key or choose I don’t have a product key
Select the Windows edition if prompted
Choose Custom installation for a clean install
Select the target drive or partition
Format or delete partitions if needed
Proceed with the installation
Wait for the computer to restart and complete setup