I recently installed the 'new' beta driver (allready a month old..) and it works great, so good in fact that i can play Oblivion at high detail with only a GeForce 6800 LE (ok, ok, it has its extra pipelines unlocked, but they allready were) without lag, the old drivers made it lag at medium detail.
download it here
Im 99% sure I didnt change anything else so it has to be the driver.
The nVidia beta driver
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