I have a 2 year old Vista machine, the biggest problem I have is that it sometimes (2-3x per day) locks up while running a major HD write or read, usually with no warning, sometimes when I haven't even been doing anything on the machine. Also, I wiped my Norton Antivirus, it would start running virus checks every week, which it was supposed to, but for some f-ed up reason it ALWAYS did it when I was in the middle of a game, and I don't spend much time playing games.