Sadly, no driver is stable for me so far they all crash about the same amount and in the same way, so i use the best preforming one which is the newest at the moment. But i only crashes ONCE yesterday in 2 WP runs, but ill need to do more testing.
But there's more drivers in november i haven't tried out. Anyways i love the last driver performance vise, increased my score on benchmark by a whooping 3k! :P
Besides im running windows 8.1 64 bit.

I'll try captain_crunch's method now and see if it works Atleast i found that in my nvidia control panel :P Thanks for all your help so far, im going to try all this.