Nvidea windows 7 gt220 not responding help to fix it?

I have Windows 7 with a nvidea graphics card gt220 and every so often the screen go black then at the bottom right it says nvidea graphics card kannel is reponding and then sometimes it goes black then turns my pc monitor off and then i need to emegancy my pc how can i fix it.|||If the message is kernel is not responding, install the newest drivers from the makers website in safe mode.