Look in your event viewer and see what it's say happened at the scene of the crash...
The problem here is that once this starts, I can't get back into
Windows at all. I can try getting into safe mode which should work.
I THINK I have solved the problem however: when I put the Matrox card into the machine, everything worked fine. The machine was in a "rolled back" state however. After being prompted to install critical updates I did, and immediately everything that happened with the 5700 Ultra happened with the Matrox. Exactly the same.
Now, looking back at what I've done these problems have ONLY occured after I've downloaded the remaining critical updates. Prior to that everything is fine. And, my system had never been unstable let alone repeatedly crashed... so, this tells me that a recent critical update has caused my crash fest. I should mention that both cards work just fine in a Windows 2000 box.
Any ideas what critical update in the past two weeks or so could cause system crashes like this? Anyone who has any ideas, I will be very greatful. In the meantime I will uninstall each critical update from the past month or so and then install them one at a time and see if I can deterimine a culprit. I will start a new thread about this.