I have GeForce 8400 GS Video Card on an AMD Quad system, 64 bit of course, Windows 7 Home Premium 64 bit.

I've been using a driver from last year, spring, I think, and it was stable.  I tried the one after that, and it all my 3d apps would crash...saying the driver failed.  So I rolled back and now, after Windows Update nagging me to do so, I tried their latest driver and still...problems everywhere, specifically when doing camera moves or anything that requires real-timey updates quickly.

What gives, Nvidia?

Do I just need a new video card, is that it?

Getting fed up.