Windows 7 Slow Shutdown “Registry Trick”

What you want to do is go to the registry and change a couple values.  Open the registry and locate
the key:

\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

then change
the value of ClearPageFile at Shutdown to a 0 IF the value is 1. If the value is 1, it will take longer for your computer
to shutdown..this fix cured it all for me.

I also did this :

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\
Highlight the value WaitToKillServiceTimeout
Change this value to 1000.