Low FPS since installing Windows 7

I have upgraded from windows vista to 7 about 2 months and since then while I like how the OS seems faster, I'm getting low FPS in my particular games in WoW.  I tried everything I could think of, uninstalling and reinstalling, updating my drivers, same recently my graphics card overclocking, and yet I am always sitting at about half of the FPS, I had when I was on Vista.  This seems particularly odd since I had to understand that 7 is a lighter OS and should not consume so many resources.  On the positive side, even if I don't seem DC or lag at all compared to vista, but the low FPS is very troubling.  It's especially bad when I'm in windowed mode, but in full screen

If the drivers are not optimized for the 7 and the last updated a year ago, I would believe it. I assume you are using the 32-bit drivers for Windows Vista found here, right? http://www.nvidia.com/object/product_geforce_8800_gt_us.html

Hmm, I don't really know what else you can try out to get a card compatible 7.

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