1) Start - Run - Regedit
Navigate to the following Registry key:
HKEY CURRENT USER\Control Panel\Desktop
Double click on the AutoEndTasks entry and replace the 0 with a 1 in the Value data text box

For the next two, if the dword value indicated does not exist, create it:

Double click on the WaitToKillAppTimeout entry in the right pane and change the Value data to 2000

Double click on the HungAppTimeout entry in the right pane and change the Value data to 1000

Reboot

If still having a problem, make the next change:

2) HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
Right-click on WaitToKillServiceTimeout and change it to 2000

NOTE: The lowest value Windows will recognize is 1000 (1 second)

ADVISORY: While rare, the "WaitToKillService" tweak can cause problems. If an application is in the process of saving data and the associated service is stopped prematurely, the data will not be saved and may be lost. (Tweak, Note and Advisory from Forum Admin)