If re-installing does not fix this error then something is either preventing VirtualBox for communicating with the Windows com server or something is blocking it.
The best I could find was it appears to be generated by the Windows host. http://msdn.microsoft.com/en-us/library ... 85%29.aspx
although no where does it specifically say what to do nor does it specifically say it is a Windows issue. I found a few tickets on bugtracker but they were all because something else changed the registry or another program, although I didn't search the entire database.
I have done as much as I can unless you have more information for me. You could open a ticket at bugtracker
and see if the DEVs can help.