If that is a mobile card, did you use the drivers from nVidia or from the laptop vendor? You want to use the ones from the laptop vendor.
I am unable to use the ones from the laptop vendor (MSI) as it requires Vista 32-bit OS whilst I have Windows 7 64-bit.
If you installed an OS without vendor drivers, you can try to re-install Windows 7 and go back to the drivers that worked for you before clean.
I have no previous drivers. It was my mate's old laptop and he does not have them either. I am going to try to run the drivers I get of the vendor's site again but run in compatability mode for Vista. Anyone think that will work?