sounds like one and the same to me. Do you mean there is stuff there you want to keep? if so then do you mean that you want to do a clean install of Windows and programs but retain other files like photos, music and video. You should give us more info on what you are trying to achieve. If you are not concerned about losing anything just reformat the drive, and reinstall everything and you will have a nice clean machine.
Alright, I have reinstalled Windows hoping it would completly wipe my hard drive, obviously that was foolish of me as i have 2 old user accounts with Data in them i dont have access to. Also since my last reinstall i've installed maybe 15GB of data. I have a 160GB hard drive but i only have 9.8GB free. Is there anyways to wipe the old contents of my hard drive? I was going to use DBAN but i was a little scared it might completlty mess up my computer. I have everything important backed up onto Flash drives, So is there anyway to wipe those old contents or do i have to wipe the whole hard drive? If i do is DBAN a good program to use?