Automatically Close Non-Responding Applications on Shutdown

Start/Run/Regedit

“HKEY_USERS\.DEFAULT\Control Panel\Desktop”
Value Name: AutoEndTasks, Data Type: REG_SZ (String Value), Value Data: (0 = disabled, 1 = enabled). Modify the value of 'AutoEndTasks' to equal '1' to automatically end tasks or '0' to prompt for action.

Note: This change will affect all users but the value can also be changed on a user-by-user basis by modifying [HKEY_CURRENT_USER\Control Panel\Desktop] with the same values.