Are you on Vista? And if so, are you running Vue in administrator mode? This could (Could) make a difference. Regarding the graphic card I would go to the site of Nvidia and check wether there is a new driver available for your card (and operating system). And update if so.

One other thing you can try out is to switch off OpenGL in the Vue preferences to see wether THIS makes a difference. Just to be a little more sure wether it is a graphic card issue or not.

One day your ship comes in - but you're at the airport.