Do you schedule the autoupgrade process, or do you have your users initiate the autoupgrade?

If Mcafee task manager is running under the system account you can't schedule it to autoupgrade using a network resource, the system account can't access network resources. But if a user was to start the autoupgrade process by hand, the process runs under the user account, and i am guessing that you users have local admin rights?

Bryce