First off hi all <--- new to the forums

i have a
dell xps 410 g
force 7900gs pci e
4 gigs of ram
intel 2 duo

i got no problems with Framrate while dual boxing but when i do about 75% of the time i get this problem




anyone kno how to fix this??


i normally play in windowed mode maximized and the fx are about medium setting. anything i need to kno ??

thanks in advance