1 simple solution i started doing years ago when running 2 computers, ATI cards superior for gaming as with nvida you have to add the game to its consloe then mess about in setings for game.
Now i put 256 gb ddr nvida super in and forgot by 2nd card from ebay now cant sli, what i found was that poser 6 would screw and crash in Xp 64 before no so added poser exe to nvida control panel.
Then turned lots options off so its a bane with nvida but pp6 runs fast now, so just add exe to nvida control panel then experiment with settings as should solve most ya probs.