This is a free program. I have never had it ask for a registration. Are you absolutely certain you installed the correct program?

See this from their website;
Our software is called Spybot - Search & Destroy and does not need any registration or password.
You don't have to pay $ for Spybot - Search & Destroy, it's freeware and does not need to be purchased.

Further please have a look at this link on our website:
http://www.safer-networking.org/en/news/2006-08-04.html

You did not get Spybot - Search & Destroy, but some other software of low quality, probably called SpyWareBot.
Our software does not need any registering to work.
Uninstall whatever it is you installed it is NOT Spybot - Search & Destroy. That is why I told you to scroll down and install it from THEIR website.