I need some answers about computer security?

I have avg anti-virus and malwarebytes anti-spyware. is there any other programs i should have?
And is spyware, malware, and viruses all i should care about? Plus what are the best free programs i should have?
and how many of each should i have? and i also have windows defender

How can I disable/delete Microsoft security system on my computer?

It is interferring with my ISP’s security system. I can’t figure out how to get rid of it Thank you.

my computer has a security program that I did not install, it just appeared, how do I get rid of it?

We have McAfee protection, but now a program called antispywaremaster has appeared on my computer and I did not download it. how do I get rid of it? i can not find it on my add/remove program. I think it is a virus. Please help?

What is the best free way to remove My Security Shield from my computer?

i need to get it off my computer and doing it manually is proving to be extremely difficult, any FREE and SAFE programs i can use?