More than enough, it is very easy to go over the top with security programs. A decent anti-virus and a decent anti-malware is all you need. The rest of it should be common sense. Right click any downloads and scan them unless you know them to be safe and do not open email attachments again unless you know them to be safe.
I personally would not have programs such as Advanced System Care 6 anywhere near my PC as they can and frequently do cause more problems than the solve.