Apple detected virus?

Hello everyone:

I have a very serious dilemma and I want to know if any of you have the same or similar situation and what I should do in terms of this.

Every time I open a new tab to search anything, pop-ups show on my computer screen about updating my flash player; to my Mcaffe software is out of date; to a virus found on a site from Apple saying I have at least a certain amount of time to download their software, if I don't then they will disable my computer. Should I believe the last example and what should I do about it?

Short summary short, I am a Youtuber, local DJ, and as well as comic book creator and I'm very concerned about my files on my computer and how people are spying on my files as told by what it seems to be Apple. I am attaching screenshots of my computer screen to show what it says.

What should I do?