hi, ive just been upgrading my dads old computer (crappy 600w psu, ASUS EAX1550TD X1550, ASUS M2N-X nForce 520, 2x Kingston 1GB DDR2 533M, AMD Sempron 3800+) and i found a problem, every time i get into xp/vista install, it will freeze and i will be forced to reboot, at first i thought this was the crappy old ide hdd, but after trying three different crappy old hdd's ive started to think otherwise. does anyone have any suggestions as to what the problem is?