The script may show that Null service is not running, script may crash...
Follow these steps only if the script crashes after that.
Download and extract this Null service registry zip file.
Run the file, restart the system (using the restart button), and try the activation script again.
If the issue persists, check if you are using Comodo Antivirus or any type of sandboxing security software. If so, temporarily disable it and run the script again.