Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
When you install the driver, it should ask you if you want to have new driver written over old driver or remove old driver before installing new...try the remove old driver before installing new method and see if it solve the problem.
I had this problem with my 9800GTX+ a while back with new driver installed over old, but after using the remove the existing driver before installing new driver option, the driver stop responding problem have since then been gone it seem.
Uninstall your driver and reboot. Then install the latest. Which at this point in time is not 301.42.