(imported comment written by SystemAdmin)
Since this is requiring the interactive, maybe try running the task 540 - Enable BigFix Client Interacting with Desktop. Basically all this does is check the “Allow service to interact with desktop” checkbox in the BES Client service.
If you check the task, you will see it links to this MSKB for a little information.
http://support.microsoft.com/kb/327618
There have been some previous discussions about if this should be a default setting or not, but for now it is not.
Martin Carnegie
Gulf Breeze Software Partners