My extension manager launches at the top of the monitor and you cannot get to the controls to shut it down or add extensions. The full list of supported programs is not visible either. I tried to move it with no luck. Any help is appreciated.
On Windows, you can press Alt+F4 to shut down Extension Manager. On Mac, press Command+Q. Then you can delete the preference file and restart Extension Manager. The file location is: C:\Users\<UserName>\AppData\Roaming\Adobe\Extension Manager CS6\Configuration\exman_uiPreferences.xml (on Windows) or /Users/<UserName>/Library/Preferences/Adobe/Extension Manager CS6/exman_uiPreferences.xml (on Mac).
If you are using CS5 or CS5.5, please change "CS6" above to "CS5" or "CS5.5".