Working on a friend's Compaq Presario, XP Home, SP2. Caught some really bad stuff, need to houseclean. Not much on it for files or additional applications, so decided much easier to transfer non-Windows things to their D drive, reformat the C drive, and reload XP. So, transferred things over, closed everything down I could see on the desktop, status bar, etc. But when I try to Format the C drive, it says it can't because there's something running. So, checked Help. Says the C drive can NOT be formatted becuz the system is on the C drive, and there's a partition on the C drive. The other part of the drive contains Compaq Recovery files or some such. What to do? I don't imagine just Deleting Windows will accomplish cleaning out the nasties? Would it work to install Windows on the D (physically separate) drive, make it the boot drive, and then could I format the C drive, maybe after deleting the Windows that's on there? Or would that still cause a problem with the Compaq Recovery files on I think it's called the H drive that's on the same physical drive as the C drive? Thanks for any info / help.