Ok well my PC recently got a virus attack, I tried virus scans but nothing would work. It wouldn't even let me do a system restore. So the only option I had was a reformat, now i'm new to Windows7 and assumed it was similar to Windows XP where I could just put my disc in and it would reformat the PC. So I put in the W7 disc (which I legally own) it loaded W7 fine, it still seems a bit slower and I noticed the hard drives weren't actually wiped, so does this mean the virus could still be on my C drive? What are the options I have, i'm not too sure how to reformat the drives, or if this will damage anything on W7. If anyone could help i'd really appreciate it.