uninstalling video drivers

okay, so i got some type of nvidia card, but thats not really important. i had a tech guy over my place and he downloaded some new drivers for my card. two problems-first is that no matter what i do, the shadows are solid black. i cant get them back to lookin like normal fs shadows, and believe me ive tried. the second is a bit more complicated. when i have anti-aliasing on, the default 2d panel like, zooms in. its REALLY weird. all i see is the panel at 5x magnification, so all i see is the very top corner. also, all of the 2d modules like the radio stack and gps are all zoomd in too. the vc is fine. my question is, is there any way to uninstall drivers? i went to system restore but the only checkpoint for july was made the day after i installed the drivers and the system restore screen wont let me go before july! any ideas?