Windows 7 Refuses to shut down

Usually when you start the shutdown process the computer waits for various processess to quite on their own. In Windows XP there was a reg key that you can set to a lower time from like 2000 seconds to 200 seconds and it would force a shutdown quicker. I think it was waittokill. You can search the Registry but be VERY CAUTIOUS one false move can mess up the whole system.
Whenever you change something in the registry, just right click and export the file to a location you can easily get to if you have to recover your system.
Like someone suggested above, run this command in the run section shutdown /s /f /t 60. These switches /s is to tell it to shutdown - /f is to force shutdown and /t is the call for time to start the shutdown you can...