Vette198484

Ok, here's the thing. My brother was on my comp and downloaded a bunch of crap from various places. Needless to say he caused my computer to crash. So I went to repair my windows xp installation. So I get it repaired (or so I thought) and I start going through my files and realized it did a fresh installation. I never formatted the HD or anything like that and I know the files are still there because I have a 250gig HD, and all that is showing up is 233gig. So my question is how can I get to my old files? I have tried everything!!!!