Sounds like a great deal, but there's an old saying "you get what you pay for." And 
that definitely applies here.

All registry repair software programs are not made equally. One registry cleaner
does not necessarily fix your registry in the same way that another one will. A 
good registry cleaner will quarantine all corrupt registry files, and delete the ones
that are deemed to be the most harmful. But most free registry cleaners will only 
isolate some problems. Corrupt files often remain on your computer as a result.

There's an opposite problem as well. Good registry cleaners will only quarantine 
a registry file if they suspect it's corrupt, instead of destroying it. But a number of 
free registry cleaners will automatically delete the registry files, and important 
information can be lost.

If you think your registry needs to be fixed, but you are not sure, you do not have 
to go out and buy a registry repair program right away. The best products offer an
initial free online scan of the registry, which will give you an idea of the problems 
your computer is facing. You then have the option of buying the full version, and 
when you do this, the registry repair software will do a comprehensive cleaning of 
your PC in about half an hour. Most offer money back guarantees, so there's really 
not a lot of risk.

This is a much better option than leaving your machine in the hands of a 
questionable registry cleaner you got for free.