Q: MacKeeper?

I get warnings that my computer (MacBookPro) is infected with (4) different viruses and that MacKeeper can clear it for me. I am not sure if it is true or fake. I have som problems lately, in the beginning it jumps out of the internet sometimes.

And sometimes it will not lock me in f.ex in hotmail because JavaScript is not on, it says. When I try again it is OK.          I have MacBook OS X  10.9.5.