Windows Defender and add the UBlock Origin extension to your web browser. You don't really need more than that these days as it'll catch the most common nasty things between them. If for whatever reason something does get through, the free version of Malwarebytes Anti-Malware is great for removing things. McAfee, Norton, Symantec etc are dinosaur products that are barely fit for purpose these days and you're wasting your money buying them. The security industry is slowly moving away from the traditional anti-virus style products.