Win 7 startar om

Try this: Press (Windows Key)+R and type in regedit and hit enter. Locate the following key:

Location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Double Click on "PowerdownAfterShutdown"

Then,
Change it to "0" if it is "1" OR
Change it to "1" if it is "0".

And hit Enter.

Then restart the computer and after it restarts try to shutdown again. Hopefully this will work for you.

***If this doesn't work make sure you change the value in regedit back to what it was originally***

Also,
Go to device manager, network adapter, your network card...right click, proparities, power managment. Check if "allow this device to wake up computer from standby mode" is selected. if so then uncheck it.
go to your bios and disable wake up on lan , or disable any setting that can bring the computer up from sleep.
updating the bios or resetting it is a big help.