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USE_VISIBLE_DESTOP to work when Condor is running as a service.
The basic steps are
- Start the Interactive Services Detection service
 - Enable Allow service to interact with desktop for the condor service
 
Both of these things can be accomplished via the Windows Services Management Console.
- Open the Services Management Console:
- Click on the Start Menu
 - Open the Control Panel
 - Select Administrative Tools
 - Select Services
 
 
If the Services option is missing, then use the following steps to access it:
- Choose Run from the Start Menu
 - Type 
services.mscand press Enter or click OK - Enable interactive services using Services Management Console:
- Find the Interactive Services Detection service
 - Bring up its properties by double-clicking on it
 - Change the Startup type to Automatic
 - Click on the Start button below the Service status label
 - Click OK
 
 - Make the Condor service interactive using Services Management Console:
- Find the Condor service
 - Bring up its properties by double-clicking on it
 - Switch to the Log On page
 - Check the Allow service to interact with desktop option
 - Click OK
 
 
Thanks to Ben Burnett for this information which was copied from his original post on his Wiki -http://ben.versionzero.org/wiki/Condor_Enable_Visible_Desktop_on_Vista
