How To Reformat and Clean Install Windows 7 on your PC. Restart your PC, and press F5, F8, F10, F11, F12, and Del to access the BIOS. This .... Formatting a Non-System Drive · Log into the computer in question with an administrator account. · Click Start, type “diskmgmt. · Right-click the drive you wish to .... Windows 7 makes reformatting non-system drives and partitions relatively simple. Howe..