IMac 24" Vista Boot Camp Video Display Problems

Just recently, as of Christmas 2007, I have had a new alumninum 24" iMac. Great machine! One annoying problem (really annoying) is under Boot Camp's Vista OS. I have a valid Vista Home Edition installed and operating quite fine.
Here is the issue:
After running in the Vista partition for more than an hour unattended (screensaver is set to blank or any other), the display is all distorted and wavy.
I have seen people mentioning video issues, and I have reinstalled Leopard BootCamp drivers, manually installed drivers as advised by others on this forum, yet nothing works. I keep getting the same ol' problem.
To explain in more detail: The screen is very pixelated and color gradients (i.e. standard Windows Vista wallpaper looks like an ugly histogram graph). When it's usually very smooth gradients of color, it's very sharp and distinct "smearing" appearance. Text and icons look terrible too!
As any tech support person would say: "Just reboot!"
Sure, rebooting clears the issue and it looks great again. Just give it an hour or two and the same ugly discoloration is back.
Anyone out there having issues with this in Vista? Of course Apple really promoted their new iMacs to run Windows under bootcamp (but they won't support it). Poor marketing if you asked me (it is their hardware).
Under the Leopard partition, I have not seen any issues with this display resolution. Leads me to believe it is for sure a windows driver issue. I have fiddled with just about all of the ATI Radeon HD drivers but cannot come up with a solution.
Any help, or updates on the drivers that may solve this would be greatly appreciated.
I'll try Apple again. Wish me luck.
Machine Details:
24" iMac (newer Alumninum - December 2007)
2.8 GHz Intel Core 2 Duo
OSX 10.5 Leopard w/ Boot Camp Windows Vista Home Edition (32 bit)

So, after three days with new drivers, I may have found an ATI driver package that might be working.
Here is what I downloaded and installed:
8-3vista32_dd59752.exe
Found here: http://game.amd.com/us-en/drivers_catalyst.aspx?p=vista32/common-vista32
I installed the package and by default set the ATI graphics card driver as an "ATI Mobility Radeon HD 2600 XT" - so far so good!
I will keep you updated if this ends up not working, but so far no smearing screens and gradient issues within Vista (32-bit) Home Edition on my iMac.
Just thought I would share - again, Apple was unable to help. On my own.
Let me know if others have success with this.

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