Windows hangs when logging off or shutting down

[Guest]

When I attempt to log off or shut down my comp nothing happens. I click on
logg off or shut down and the menu goes away but it does not shut down or log
off. The computer works fine after attempting this, like I didn't do anything

 

[Malke]

When I attempt to log off or shut down my comp nothing happens. I
click on logg off or shut down and the menu goes away but it does not
shut down or log
off. The computer works fine after attempting this, like I didn't do
anything

It is always smart to first make sure your computer is
virus/malware-free:
http://www.elephantboycomputers.com/page2.html#Removing_Malware

Then go through this excellent shutdown troubleshooter:
http://www.aumha.org/win5/a/shtdwnxp.htm

And as always, ask yourself: The First Question Of Troubleshooting: what
changed between the time things worked and the time they didn't?

Malke