nVidia driver stopped working

Hi all,

I've recently reformatted my PC, and downloaded the latest drivers for my nVidia card, geforce GTX 550TI, and I started getting errors...

"Display driver nVidia windows kernel mode driver, version 310.90 stopped responding and has successfully recovered."

This can happen as often as 4 times or more a minute, or as little as once or twice an hour.

Anybody know what I have done wrong? Because I have tried uninstalling these latest drivers, even deleting them nvidia folders one by one in the system registry, tried installing up to 6 different older drivers, none works...

The older ones are w orse in that they hang my whole system...

Appreciate any help coming my way.

Thanks!