threat defense

The computer does not know what is going on, with threat defense as I opened the website what can slow a lot, but I think it is to install threat defense, or if my machine appears what questions how to do it, I don’t know how to solve this problem, I think my computer is slow after I don’t want to touch it, but my friends say you are not so stubborn, after the computer installed threat defense, you can still ensure that the security of Internet, I don’t know how to do, there are in fact I want to do a lot of things, but I will not because of the opinions of others to change my own schedule.