Display Quality issue after updating to Bootcamp 3.1 (windows 7 64-bit)

I managed to install Windows 7 64-bit without issues (all issues got resolved after installing bootcamp 3.0 from the OSX DVD).
Then I saw the BootCamp update for windows 7 64-bit as being (Recommended) and I installed it...
after that I got a problem in the screen where I get low quality in gradient colors.
I tried installing the ATI Radeon 4850 Driver from the ATI website , but without any luck, the driver is identified correctly and color depth (32-bit) , but still the quality isn't acceptable.
Anyone facing similar issue? please advise ? I tried restore point but it failed.
Any suggestions?

RegrettingSwitch wrote:
I think that any of you expecting (as I was) non-mobility cards are going to
be disappointed (as I am). SiSoft Sandra definitely reports Radeon HD4850
Mobility in my iMac, which is the reason I can't install the latest Catalyst
Are you sure? Since both CPU-Z 1.53.1 and Catalyst Control Center are stating that my graphic card is a ATI Radeon HD 4850 (device ID 944A).. :S
So, Bootcamp 3.1 seems to have solved nothing (plugging headphones in still
jumps one core straight to ~100%) and actually created a problem that didn't
exist - i.e colour banding!. And, obviously, no software fix is going address
You could try to roll back the driver. I've more or less the instruction written in this thread and at the moment, with 8.661 version of the driver I don't have the color banding issue (I've to test stability yet, since it seems that this driver version is quite more unstable).
However, yeah I feel your disappointment, I'm a Mac user since 2001, changed several macs and this is the first one that comes with so much issues.

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