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Folks, if you're going to have a third-party antivirus/security program on your PC, then please keep it up to date. If you decide to let the subscription lapse, then uninstall it.
With an expired subscription, security/antivirus programs are so much worse than useless. It refuses to work AND prevents the built-in Windows Defender from working.
This PSA is brought to you by a McAfee trial that expired 400 days ago.
@arielmt It can also be exploited as an attack vector by malicious programs for root access if it has unpatched vulnerability
https://cybersecuritynews.com/hackers-abuse-avast-anti-rootkit-driver-to-evade-detection/
Related: The only thing Microsoft Edge seems to be useful for is letting random websites use Windows notifications to spam the user with dire warning messages about viruses and errors that desperately need to be cleaned up if you'll just click here, only to land on full-screen tech support scams urging you to call Windows at 1-800-FLEECE-ME right away.