After using AdwCleaner, windows suddenly not legal?

[NekoJonez]

Since I had to kill a pesky piece of adware, I used AdwCleaner to remove it. Meanwhile I was removing some retro games to gain more diskspace. 

 

I remember that either Avatar or Lego Alpha Team remove a DLL file that claimed to be used by other programs. (Maybe it's related, I dunno.)

 

Yet, my legal Windows 7, which was pre-installed on my laptop... Is now suddenly an illegal copy? 

 

What now? 

[David H. Lipman]

Boot into Safe Mode and restore the system using the System Restore service from a date when it was still recognized as being a legally licensed computer.