Here is a quick review of the RegistryClear/Registry Clear/ software. Although it doesn't matter what you call it, you should stay away from this software.
So why should you stay away from this software? Because of the tactics this company uses. They try to install RegistryClear on your computer through fake error messages. In addition, they also claim Microsoft supports their software (Microsoft doesn't). If you don't believe me, all you need to do is just check out some of the user comments about this company on McAfee SiteAdvisor. Believe me, it's not pretty lol.
Don't even waste your time with this software. Just stay away!