3 month old 9500 GT displays fuzzy windows

[kquick]

I have a 3 month old 9500 GT that started just this past Monday giving me fuzzy windows on one of my dual monitors. It seems to only give the fuzzy screen on whatever window I have the extended desktop on. The fuzzy screen only happens when the video card is on its highest setting of (1680 x1050) for both screens, however, if I change the extended desktop setting to a smaller resolution the problem goes away. I have updated the drivers to NVIDIA's latest driver but it didn't fix the problem. I am using VGA cables which shouldn't be a problem since it worked for three months. I checked the cables and the monitors on different machines and they all work fine. Any ideas on how to fix? Thanks.

Machine Specs:
Vista Home Prem. 32 bit
AMD Triple core 8400 2.1 GHZ
3 Gigs RAM DDR667

 

[Tmagic650]

Is your Vista upgraded to Service Pack 1?

 

[kquick]

Yes, I forgot to mention I also updated vista through their updater.