Hey! For what it's worth, I'm running XP SP1 right now. I had no problems with it. There are indeed issues for it though, depending on what kind of computer you have. Certain brand names will not boot up if you install SP1 (can't remember if it's HP, Compaq, or what! you'll have to look it up). Other than that I have not heard many problems aboot it, or had any myself!