egva has the newest drivers for 8800s 158.45 for vista. nvidia has the 158.24. i dont know which one is better for you but i m using the egva's 158.48 and i think its good.
You can uninstall them in the Add/Remove programs, or I believe now (might want to check) that the latest Nvidia drivers will remove the previous ones when prompted during installation, if they have not yet already been removed.
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