When I click within safari a pop up opens

I have had my macbook pro for a few years now. Solid state, no issues AT ALL. Recently this annoying habit was formed.

When I am in Safari, when ever I click on the page, anywhere (link, background, empty space, etc) Safari will automatically open up a new tab with an advertisement.

This happens on the initial click on every single new page that is opened. I tried searching within the community for previous resolutions, the most recent I could find was to do with a trojan "Vsearch" I could not find that within my computer, and the author responsible of the solution state the problem would adapt, thus the solution would change. I am running OS X 10.10.1

Has anybody experienced this and found a solution. I am not at all proficient in the world of computers, programming, or anything similar. I am usually careful when downloading and using the internet. Though I do visit torrent sites often.

As you can imagine this problem is extremely tedious and excruciatingly annoying. Any assistance would be much appreciated.

Happy holidays (which ever one you celebrate)

Also, I just remembered. In the safari address bar, When I begin typing it will end in "- search Google", but when I press enter, it takes me to the Yahoo search engine with results.... possible connection?