Windows 7 Domain user with local admin rights OFF the network

Tried HP LaserJet P2015 from cd with network disconnected; Setup starts, runs for a minute, then provides error stating you should try the "Run as admin". Restarted, tried to run setup manually WITH Run As - no change - Darned!
 
OK, but I just got to know....how does it fail? Do you get an opportunity to enter a username and password? And if so do you use the fully qualified domain username like whoever@whatever.lan or does it just do nothing?
 
"Does nothing" would be the answer; User is not prompted to enter anything, doesn't have a chance to enter anything. Not prompted to enter a admin password, or user/password combo. I'm guessing because they are in the Administrators group already??