I would also like to add that I just ran a Malware scanner on my computer that detected a very nasty .ms trojan something or other that hides in the background breaking stuff, a level 4 out of 5 on the threat scale. I am obviously wondering if that could be a reason its not working.
I know other people have reported this problem, but I have not heard any body offer a solution or admit that it is a bug they need to fix.