Upgrade from athlon 64 3800+ to athlon 64 x2 4400+ causes video card to fail

I have just upgraded My CPU from a AMD Athlon 64 3800+ to a AMD Athlon 64 X2 4400+ and this causes My graphics card to become disabled. I have switched back to the 3800+ and everything is fine again. I thought it was the processor so I exchanged it and I am having the same issue. The specific error for my Graphics card is "Windows has stopped this device because it has reported problems. (Code 43)" I have uninstalled and reinstalled the Drivers for the Graphics card and Have updated the Bios to the latest version. I have a 500watt PSU so that should not be a problem either.

Here are my Specs:
Operating System
MS Windows 7 Ultimate 32-bit
AMD Athlon 64 X2 4400+ 109 °F
Toledo 90nm Technology
3.0GB Single-Channel DDR @ 157MHz (2.5-3-3-7)
Gigabyte Technology Co., Ltd. nForce (Socket 939)
@ 1280x1024
ATI Radeon HD 3600 Series (ATI AIB)
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More about upgrade athlon 3800 athlon 4400 video card fail
  1. I take it that you have the dual core optimizer http://support.amd.com/us/psearch/Pages/psearch.aspx?type=2.1&product=2.1.2&contentType=Tech+Download+Processor&ostype=&keywords=&items=20 installed and that the system recognizes the dual as a dual. Another thing to try is to do a repair install of windows.
  2. I have the dual core optimizer installed. I have not tried a fresh install. I was hoping to find a different fix. I cannot understand what is causing this since just swapping to the old processor fixes the issue and yes the system recognizes the processor as a dual core. Any other ideas?
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