On this page: Gathering of Tweakers, a dutch IT forum someone has had the exact same error message, obviously without the details of the "problem history in the Action Center control panel" I can't really say more than that. If you provided that information we would probably have more to go on, or it might at least give some clue.
See below (translated):
After a fresh install I have another problem during the boot. The taskbar appears to be freezing and after clicking on it and then on the desktop it comes back after a few seconds.
In the eventvwr I came to this:
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The program Explorer.EXE version 6.2.9200.16384 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 8B8
StartTime: 01cd815d6a10d264
Termination Time: 0
Application Path: C:\Windows\Explorer.EXE
Report Id: b2595ccb-ED50-11e1-be7b-002522be6759
Faulting package full name:
Faulting package-relative application ID:
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I can not find the cause of this... I strongly suspect it's a driver. But last day it was fine and there is nothing else installed. The last thing I did was the "Windows Experience Index" test.
You see he notes the last thing done was the windows experience index test, maybe you did that last too?
Other users of that forum have indicated it could be a driver issue, so try updating them as in the other answer.
Something else worth waiting for is the hotfixes to be release when windows 8 is officially released, these kind of issues may be fixed then.