Reg Defense - Version 4.1 RegDefense helps restore your computer to run like new. RegDefense prevents PC slow downs and crashes by cleaning up registry files and errors. RegDefense provides a safe way to effectively manage your computers registry and maintain computer health. Computers are slowed down by the programs we install. Without using RegDefense you may have problems like windows errors, slow computer, crashes, etc. We Offer a Solution to these problems and using it is as easy as clicking a mouse!