Edit: Ah, I've got that fixed!
But, take a look at this...
According to my Advanced Settings for my display, it's still using 1.5 GB of ram. I only have 3.5 GB in my system (total = 4GB, but I am running Vista 32-bit). Does this mean that my PC is acting as if it only has 2GB of ram? I did what Atomic said and used the device manager to uninstall my previous display driver, but it seems as though the machine is still trying to used shared memory to enhance the card.
Am I right about this? If so, is there another way to disable the onboard memory? Or did I do it wrong?
I do have to say, though, I am quite glad that upgrading my memory and video card has improved my Overall Index Rating from 3.0 to 4.5! Simply from the graphics sections haha