I absolutely agree that you should normally avoid running two antivirus together but I've always viewed Malwarebytes and CryptoPrevent (which isn't on Kaspersky's list yet, glad to see) as different from normal AVs. They both play very nicely with MSE in W7and, I understand, with Defender in W10. When I am dragged kicking and screaming to Windows 10, it'll be Defender, Malwarebytes and CryptoPrevent for me. And a very wary eye on what I download or open in the way of attachments, as always........