We just installed Windows update on a few PCs and found that after installing KB924191 we were not able to view items in archive explorer. After removing this update we were once again able to view archive explorer. Here is the link to MS for info on the update. http://support.microsoft.com/kb/924191 We are still looking into this for more details, just wanted to share our findings and see if by chance anyone else has been down this road.
thanks,
Travis