try this it decreases the time windows takes to shut down processes.
* Start Regedit.
* Navigate to HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control.
* Click on the "Control" Folder.
* Select "WaitToKillServiceTimeout"
* Right click on it and select Modify.
* Set it to a value lower than 2000, say 1000 as a test.