I had a issue with the Cisco ASA ASDM gui not loading. Turns out the new java is causing the issue. If you run it in Java 6 it works.
http://tcpsolution.com/files/java/jre-6u43-windows-i586.exe
http://tcpsolution.com/files/java/jre-6u43-windows-x64.exe
Source Post stevenmcconnell https://supportforums.cisco.com/discussion/10478416/asdm-unable-launch-device-manager
