CNET staff not advertisers, partners or business interests determine how we review products and services. If you buy through our links, we may earn a commission. Your free antivirus will almost certainly include upsells for the premium version, but it shouldn’t include third party ads or come bundled with spyware. Your antivirus company should have clear privacy policies stating the data it will collect and how that data will be used. At a minimum, you want easy scan scheduling and o

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