Theyre called BETA drivers for a reason. Theyre not meant to be mass used. Theyre pretty much for test purposes only and for the modding community. NOT for general use.
but beware OFFICIAL drivers are not a warranty of stability anymore.
Beware of the latest official nvidia drivers though i don't rememeber the video card series right now but they mess with game pretty serious.
Here you go:
"OFFICIAL and lastest" nvidia drivers: