i would actually try to install the game as well, make sure all ur DLL's r in place, shoot even make sure ur direct X is up to date / installed correctly that 460 should rape the game,
this is what i would do in a list from first to last :
reinstall drivers, (guide is Here
Reinstall game making sure all DLL's and direct is correctly installed
copy paste yitch3 in there,
make sure ur Vsync is off?
Check ur in video options making sure it is all low