If you have the same problem as mentioned above (see screenshot) this is how to fix it :
Doing the following activates it using the MAK key:
1) Open a cmd shell as Administrator.
2) Type the following (but use your key instead of all the X’s)
slmgr -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Voila : Windows is activated!
