As you know theres nothing more annoying then a PC that takes ages to shutdown. 
These registry settings wil increase the speed in which windows stops processes and services once the user has initiated a shutdown.
Download Shutdown Registry Fix Here (Virus Scanned)

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Control Panel\Desktop]
"WaitToKillAppTimeout"="1000"
"HungAppTimeout"="1000"

[HKEY_USERS\.DEFAULT\Control Panel\Desktop]
"HungAppTimeout"="1000"
"WaitToKillAppTimeout"="1000"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control]
"WaitToKillServiceTimeout"="1000"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
"ClearPageFileAtShutdown"="1"