I can confirm that the method in the previous post works.
The ASUS Live Update thing did this to me twice before, where the command prompt pops up "for no reason" and then knocks the screen resolution way down, and the way I solved it was to use the drivers CD that came with the laptop. An annoying process, but it worked.
But now that it did it for a third time and I figured out that it was the Live Update to blame, I opened the Live Update window and clicked on the gear icon (after the update installed, which it gave no indication of progressing until it was done) and changed the settings from updating automatically to prompting me to give the OK before doing anything.
Hopefully this doesn't happen again. My G74sx rocks, but when that Live Update would make everything wacky...that was annoying, to be kind.
So yea...go to that Nvidia link, install the driver. When you go to run it, it will tell you that it can't run. Restart and run it again. Restart again and everything should be back the way it was.
Also...you guys all play Diablo too. Funny. That is one thing that really irked me, is that Diablo wouldn't work.