Hi,
As others have answered, the only way to get the key or Registration Number is to buy the program.
But, I also suggest using AdAware and SpyBot. They are awesome!
Here is another free program I use, and since using it, for the last months and months, have not had even ONE spyware program get passed it. It stops stuff like this from getting into the computer in the first place.
http://www.javacoolsoftware.com/sbdownload.html
SpyWare Blaster 3.4 is really, really great.
I do wish you the best.