Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
RegistryCleanFix is a rogue anti-spyware application. RegistryCleanFix gets into the system via Trojans through browser security holes, and other illicit mechanisms. As soon as it gets into your system, RegistryCleanFix will show you an exaggerated scan report claiming that there are invalid and corrupt keys in your registry. By doing so, RegistryCleanFix tries to trick users into buying the commercial version of the program.
Technical details (How to remove RegistryCleanFix(pop up))