Flickers With E-gforce 6200 Card

i recently instald a e-geforce 6200 graphics card on my pc and have had no troubles so far except that my screen flickers when i play world of warcraft. It only does so when im in fullscreen mode, if i run it in windowed mode it works perfectly fine is there something or someway i could resolve this. i recently bought a 32" lcd hdtv i use as a monitor, my pc is an intel 2 duo 2.8ghz processor, 1 gig ram and i also recently instaled windows vista home premium 32 bit versoin if specs on my pc help with an ansewer any.