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I had this problem with later catalyst drivers too, but there is a solution that works (although it will make things slightly slower I think).
ok, Click Start, Rightclick My Computer and click Manage.
Then go down to Device Manager.
In the device manager, select System Devices and then Right click "Via Cpu to AGP 2.0/3.0 controller" and then select "update driver".
Select No to windows update if it appears, then install from a list or specfic location.
Select "Don't search" and then change the driver to "VIA CPU to AGP controller".
You'll have to restart and it might be slower, but it should stop the crashing and at least you can then use up to date drivers.
I believe that the problem is actually a power problem, so if you can update your power supply.