Only run one anti-virus program and one spy/malware scanner program on your computer at the same time. Several programs of the same type tend to conflict and might prevent eachother from functioning properly. Google for "good free computer protection packages" and similar phrases and you can probably find a place where someone has bundled the best free programs and made sure they work well together. If you simply install Avast, AVG, Norton and Kaspersky, you're most likely just getting them all tangled up.
Malwarebytes is good and tends to work with any actual anti-virus program. Norton is fine at catching stuff but it isn't very nice to your computer. AntiVir is alright, but the almost-always-true rule is that you're much better off paying for a product than going with the free ones.
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