One simple scam, used by smaller "companies" is to use spyware/ad-ware that gives you a warning that a virus
may be present. They can protect you (for a small fee, of course). In most cases, a true virus never exists. Some have planted viruses and sold removal software, but these are probably quite rare, since there are hackers that would destroy their systems, if they caught them, plus the government has fined the ever lovin' dog doo out of some of them. It's much safer for them to deal in "might haves, and could bes", rather than actual viruses.
I recently heard some good things about these folks. They make their money by selling other products, and radio program advertising. This site is their public relations program. If you like what they give you, you're likely to buy what they sell. Their downloads include a list of servicing you should do, step by step on a weekly basis, similar to what cv mentioned.
www.savemybutt.com
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