A registry cleaner is a class of third party software utility designed for the Microsoft Windows
operating system, whose purpose is to remove redundant items from the Windows registry.
Registry cleaners are not supported by Microsoft, but vendors of registry cleaners claim that they are
useful to repair inconsistencies arising from manual changes to applications, especially COM-based
programs.
The effectiveness of registry cleaners is a controversial topic, with experts in disagreement over their
benefits. The issue is further clouded by the fact that malware and scareware are often associated
with utilities of this type.
https://en.wikipedia.org/wiki/Registry_cleaner
