my TV capture card not working with my MSI based Nvidia 4mx 4000 graphics card. but it is working fine with onboard graphics card.

system spec

msi motherboard(km266) with onboard videocard(S3 prosavage ddr)

intel celeron 2.4 GHz processor
512 mb ram( 2 256 MB)

when i start my TV tuner program it runs well for some time and then it freezes . i have to restart cpu. it happens again and again so i removed graphics card, tv programs i can view without any problem

can any one help me

thanks in advance