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On this virtual way it is not easy to say why this happen but probably OS is blocked somehow.
What happen when you press shutdown button?
Maybe by some running process in the background.
Before you use option for shut down, stop some running software that you can find in notification area (notification icons).
If this will not help restart your notebook, do the same again and open task manager. Check if some of running processes has extremely high amount on memory. If yes stop it and try again.
Maybe playing a bit with background processes you will find out what is wrong there.
I agree with Feliks. I think that some processes which are running in the background lock the system and prevents from shut down.
If you access the task manager (ctrl atl del) you will see what applications and processes are running. Closing this could help to solve this.
You can also use some tools like CCLeaner in order to clean the system and registry.