i have a bit of a problem..

i recently upgraded my pc and got an nvidia gforce 7800 gt graphics card, and since then the game engine in blender runs choppy. i had integrated ati before and it ran better… is there anything i could do or is this my bad luck again… thanks in advance for any advice.

yeah also, when i play my game, all of the objects bounce up and down and wont stop. i used to have a different version of blender, i forget which one, and i never had this problem. the only way i could fix it is turn motion dampening all the way up. but this could give undesirable results for controllable objects.