Is it your monitor that tells "Not responding"? like if it was disconnected from your graphic card and getting no signal?
It has to do with the fresh reinstall.
What I can think of:
-Faulty driver from nVidia, which you weren't using before reinstall. But you said you've tried previous versions.
-Some driver setting that your monitor doesn't like, which was correctly on/off prior to reinstall.
-Maybe you had special driver settings for those applications (FF7/8/epsxe) and now they're following the global settings.
-Maybe your card-monitor wire is the culprit?
-If you can, try some other port from your card/on your monitor, if you have a corresponding wire.
-Maybe updating to a newer bios version (if there's one) would be good? (but you know, beware, don't brick your board..)
Also, get in touch with nVidia and/or your monitor manufacturer tech service.