dude i have an asus k53sm with an nvidia gt630m i could easily install the 301.42 driver however i faces the same problem as you while installing 304.348 beta.
I still get the message that there's no compatible hardware when I try to install the 301.42 driver. Let me try the newest beta...304.79... YEAH! It worked! Guess I'm a beta tester now!
Did you try 304.79 yet?