Here are some tips for BlackBerry developers running the device simulator on Windows:
Problem: Build Failed/access denied when running 'ant load-simulator...'
Just right click on the Windows Command prompt and choose 'Run as administrator.'
Also consider dragging the Cmd prompt from menu to desktop to make testing easier.
Problem: When I minimize the device simulator in Windows, I can't bring it up again...
This works: change to a different simulator by modifying the PhoneGap configuration file
project.properties in the folder ..\phonegap\BlackBerry-Webworks.
Here are two examples. Just comment out the one that hangs and uncomment the other one:
sim.dir=C:\\Program Files\\Research In Motion\\
Good luck, hope this helps.
BlackBerry WebWorks Packager\\simpack\\5.0.0.469
###sim.dir=C:\\Program Files\\Research In Motion\\
BlackBerry WebWorks Packager\\simpack\\6.0.0.227