Originally by: Born Slippy
I have windows XP OEM installed and want to overwrite it with Vista ultimate OEM.
It's like millions of little nerd voices all cried out in anguish
Aside from the pleas to "please, please, for the love of whatever's holy to you, don't do it"... is it NTFS of FAT32 ?
I can only assume it's NTFS.
If you want to really, really make 100% sure it's "completely wiped out", you're going to need another PC (or at least another HDD with a WinXP install, or a different partition with an OS that can read/write to NTFS partitions).
Why ? Because you need to delete all system files in the root folder, which are "locked" while you run Windows normally.
Deleting program files and documents and settings is optional, but might also be a good idea after you back up what's important to you.