My computer is jumping around & messed up! Please help!?

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I don't know what's wrong with it. I have a gateway & I use Torch because my internet explorer has gotten to where it doesn't want to work right & the google chrome. I was using firefox but for some reason a dozen new tabs pop up with something like player setup & pc booster or something. Well now on Torch every time I do a google web search and the results pull up my computer will move the page up and down over and over again and I can never look at the results without quickly scanning and clicking before the page moves again. It's like "something" is moving the little side bar up and down constantly. I also keep having these ebay hot deal ads pop up every time i'm on a shopping site. and it's always 2 or 3 of them and I have to click the x every time i pull up a page just to get them off. It's driving me crazy! what do I do? I uninstalled the yontoo (YT) downloader but that hasn't stopped anything. Please help me! also the computer is only a few months old & it didn't start this til about the first of the week. It's also windows 8
And I don't ever shop on ebay so i don't know why the deal ads keep popping up