system
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I uninstalled Malwarebytes Free as one of my very first troubleshooting steps using Revo Uninstaller, and verified all remnants of it were removed. I have Comodo Firewall installed but do not have their antivirus installed (and never have had it installed). I’ve never had any other antivirus or other security software installed with this installation of Windows.
I uninstalled Avast using its own uninstaller and then manually removed remnants left over in “user” directories. I will try to uninstall using the Avast uninstall tool and reinstall.