Ge4 ti4200 vivo/dvi ( external) that WONT WORK

built my new pc not long ago. epox board. 512, athlon 1.6 ghz, sb audugy ex, 80gig but for all my trying including using win 2k and xp it wont work. got no conflicting IRQs, tryed EVERY detonator. it will only run UT in open GL on occasion. it just doesnt like any games. does everything else i ask it however. tryed apeture settings, tryed any option i can in bios, tryed under/over clocking the card in software. formatted numerous times. tryed multiple versions of the same game… PLZ HELP!..BF and Q3 await! My username tells the story…

video card?
video driver version?