Thankyou.
Here is the driver download page.
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Try installing the graphics driver again.
If your machine uses an ATI graphics solution use the driver found in the link above( you'll have to use a vista driver).
If however you use an Nvidia solution, Nvidia write laptop drivers themselves, so you could get the driver directly from them:
Drivers - Download NVIDIA Drivers
I'll be back a little later so please let me know how you got on..