Vista or XP? Little help!

[caribbean_spur]

Yeah, but I have a friend who try to downgrade and had all sorts of problem while doing so. Not sure why but it seemed that a normal clean install just did not do it for him. I have been surfing the net about downgrading and it is quite a challenge but, well, if I have to do it I have to do it. Hopefully this is not going to take me to much time and frustration.

Thanks for the answers though, you guys are great!

[leemajors]

format, reload. there shouldn't be a problem unless the HDD has issues.