Hi,
Please refer to the following article and install the hotfix to check the result:
There is a delay when you shut down, restart, or log off a computer that is running Windows 7 or Windows Server 2008 R2
http://support.microsoft.com/kb/975777/en-us
Also, you could try the method mentioned in the following link to speed up the shut down time:
Windows 7 - Shut Down -Speed Up
http://www.sevenforums.com/tutorials/717-shut-down-speed-up.html?ltr=S
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Alex Zhao
TechNet Community Support
