Graphics card Asus Nvidia gtx 275 When I tried to install the latest driver software it will not install the new driver. it says "System not modified" or "cannot find the Graphics card" When my computer starts a notice comes up "Cannot find Graphic Card Details" The graphics card is not shown in the device manager but it is shown as "Unknown device" I have tried reinstalling the older driver but that wont install either it gives me the same error messages. Can anyone help me please. PS I have just noticed in the properties box for the device (in device manager) it says "access denied" what do I do to gain acces ??