Just a few things that might help. I'm not in Windows 7 right now so bear with me
What kind of performance rating are you getting on the GPU?
How much RAM is installed? It should run fine with 1 GB but 2 GB is Microsoft recommended minimum for X64.
Go to Control Panel with the category view and see if there's anywhere that you can change your display settings, monitor refresh rate, themes or visual effects.
Are there any items missing drivers in Device Manager?
"The great majority of mankind are satisfied with appearances, as though they were realities, and are often more influenced by the things that seem than by those that are." - Niccolo Machiavelli