Putting a computer together for a friend. Specs are AMD Duron 1Ghz, 128 megs PC133 RAM, Geforce 2 TI 64meg, Win XP HOme. Tried an installation of Win 98 SE, then an install of Win XP. Every time I try to run anything graphical the machine locks up. Even tried 3DMark 2001 and no good there either. Any suggestions??