Ultimately all AV are rubbish. Some are terrible. Many dramatically slow computer. Switch off real time scan and only scan on demand when you download/install new content.
Most cause more problems with false positives than prevention. None block new threats.
Script blocking on a web browser, not clicking links in email, disable all Autorun, disable uPNP (esp on Routers) and disabling vulnerable services not needed, ignoring unsolicited support calls etc are all far more effective than AV programs.
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