anyone know why geforce 256 ddr has weird vid problems now?

[teras]

i just upgraded to a msi k7t pro2-a mobo and a 1gig t-bird..don't get me started on the messed up mem benchmarks but anyways...when i go on the internet and certain things show up fine pictures i'm talking about but than i'll go somewhere else and the pictures will have horizontal lines growning through them and you can't see the image. also dvd playback sucks!!! i can't see anything other than fuzz and lines....any idea's? i have the 4in1 drivers..any other drivers i should try?