I have been using the system of advance of one year and met with the problem of the PC, because, in fact, has corrected the error when I go to play around with regedit, I use it every time I go down the Internet and is spyware. I have the Pro version is installed on two PC with IObit Security360 too. As these programs, they do what they say. Yes, there are more powerful cleaning and have not used so much that my PC does not start, I'm Leary of registry cleaners to begin with, but not both CSA about cleaning as I am beginning to a cleaner, I see a difference after use.