When I cliick Start > Shutdown I see the 'shutting down' screen and the little twirly thing. But then it stops twirling and hangs there 
After about 4 minutes the system restarts and says it's recovered from an error. I did some googling and created a shutdown.bat script which did used to work, but now the system hangs with that aswell.
Any help would be greatly appreciated. I'm using Windows 7 Pro 64bit and it's updated.

After about 4 minutes the system restarts and says it's recovered from an error. I did some googling and created a shutdown.bat script which did used to work, but now the system hangs with that aswell.
Any help would be greatly appreciated. I'm using Windows 7 Pro 64bit and it's updated.