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Comparison tests of antivirus products – including some that are free – vary widely. So experts advise anyone looking for a good version to check multiple tests, such as those by AV-Comparatives, AV Test and PC magazine. More comparisons can be found by doing a Google search for “antivirus reviews” or “antivirus tests.”

Be especially careful of antivirus promotions that pop-up on computer screens, experts warn. That’s because some of them are bogus and designed to infect computers with malware.

Computer users also are advised to keep their antivirus products and operating systems updated and to never click on links or attachments in emails from unfamiliar sources. If you suspect your computer is infected, experts say, stop using it for online banking, shopping or other activities that require passwords or other personal information.