I noticed with my previous cards that newer drivers seem to cause problems on older midrange cards. My 7950Gt runs fine with the newest drivers but my old 6600GT didn't, I used some older drivers for it. The same might apply to the 7600GT series.
You could also read LEN 's Guide to Modified Video Drivers Galaxy.
Also note that the newest drivers don't necessarily speed up your card, I think they're more about tweaking performance of those newer GeForce 8 cards and losing maybe 1fps isn't really a considerable loss IMO.
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