We indeed do not advise the use of registry cleaners, as their use can range from achieving nothing to causing severe problems.
I've not done a fresh installation of Auslogics Defrag for some time. Many free programs are now being bundled with other options that you have to "opt out" of during installation. Did you by any chance unwittingly agree to installation of another program as well?
Edit: Just downloaded & installed, I see what you're referring to (hope you declined Ask...). Looks like part of the free package is a promotion for the Registry Optimizer - I'd suggest this can safely be disregarded. My system which is working quite stably shows 522 supposed registry problems. Tests have demonstrated that registry optimizers find hundreds of these "errors" on brand new Windows installations - it's a normal part of Windows operation and causes no problems.
Edited by Platypus, 23 October 2012 - 01:14 AM.