this post is for my dad. He has XP & Vista on his PC. He upgraded to 4gb's of ram today and he had some problems getting it to work. So I went over to his house and got his timings right and everything was kool. Now the problem that I cant fix is that it will boot into vista just fine ...but NOT XP. It will try to boot but then it just restarts. What am I missing ? I didnt work on it very long but I am sitting @ my house and i just cant figure it out. I know that XP wont see all 4gb but what would cause it not to boot @ all on XP and boot fine on vista...its driving me crazy...I think its something simple that I just missed. help me please I am going insane..AAAAARRRRGGGGGGG