I would recommend that you never use any security product downloaded free from the internet.
I recommend that you use only a professional, all in on security system, that updates automatically, all day long.
I would recommend that you never install mismatched security programs, which cause system conflicts.
I would say that if you are using "free" security, your computer is largely UN- protected, and the security is full of holes.
I would say also, that the majority of infected computers, that I repair, have these "free" security programs installed. AND that these "free" programs did little or nothing to protect the computer.