THIS FIX ALSO APPLIES TO WINDOWS 10, IT IS EVEN MORE IMPORTANT, BECAUSE WINDOWS 10 TURNS “FAST STARTUP” (read below) BACK ON AFTER UPDATES (yes, Microsoft does not stop creating nonsense features / bugs).
TO DISABLE FAST STARTUP ON WIN 10 THROUGH GROUP POLICYPREFERENCES CREATE THE FOLLOWING KEY:
HKLM\System\CurrentControlSet\Control\Session Manager\Power\HiberbootEnabled
and set its value to 0 !