Windows 7 is very slow to shutdown

admin

Open the registry and locate the key
{ \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management},
then change the value of ClearPageFileatShutdown 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.