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I have a feeling that these software companies prey on fear, so that people buy extra security when they already have sufficient protection.
I purchased XoftSPYSE by Pareto Logic in a similar way, having read reviews. It certainly found some spyware that my Virgin Media software did not find, but nothing that was serious. I have not bothered with this extra software when the licence was due for renewal, as the latest VM PCGuard appears to be pretty good.
As a note of interest, since I have stopped using Internet Explorer and now only use Firefox, I don't appear to have the same level of security issues. I moved to Firefox, when there was a security issue with IE, for which there was no software update immediately available. There are a lot of people in the IT world that have issues with Microsoft and I have a feeling that the security of their software is subject to more malicious attacks i.e viruses.
I don't know much about CCleaner or Windows defender to comment. Personally if I did not have the VM software, I would go for Norton, which I have used before and it gets good reviews.
Huckster