McAfee Scan

on every McAfee scan I attempt I get this message: "unknown error received from scanners", and then the scan stops.

using MacBookPro, OSX 10.11.6

I've also received this message today:

"Dear Subscriber,

Cox has identified that one or more computers/ devices behind your cable modem may be infected with the FakeSecSen or "Spy Sheriff" Virus. A device behind your cable modem appears to have connected to a command and control server affiliated with this malware."

There was other info about selecting McAfee or Norton, etc.,

I'm concerned about the malware...

any ideas re. '...scanners', or the malware?

Thanks!