We bought this computer a few months ago...and the only thing we changed was the OS...it came with Windows Vista, which sloooowwwwwwwwwed it down horribly.  It took at least seven minutes to boot up, and it did odd things like freezing up, and then all the little pop-ups regarding allowing the user to access things...ugh.  But we bought  XP, and everything is great.  This computer rocks!!  The sound, graphics, speed are fantastic.