I havea a Geforce 6600 graphic card. No matter which Nvidea driver I've installed for it in the past, it always goes so far before it freezes my system - especially when watching video clips or scrolling up or down windows.
Google Earth is a dead cert to freeze the thing!! - whether I run it in Direct X or OpenGL modes
Even Alt+Ctrl+Del won't get me out of the problem when it freezes - nothing works and I have to press the reset button.
However, if I uninstall the driver the card works fine without freezing at all (though refresh rate is very sloooow!)