FUN FACT: This was once included in the official MAS repository. They later removed the functionality and credits :(( (probably cleaned it up).
Cleaners and spoofers not only remove activation, but often make it impossible to activate again.
The Activation.bat file is the main tool.
Use Activation.bat.exe version if the Activation.bat doesn't work
Activation.cpp is the source to Activation.exe
For 0xc0000022, 0xc004f016, 0xc004f012, 0xc004f015 and numerous other activation-related errors