Do you find certain words are highlighted and when you hover over them there is an ad underneath?
Either way you may be infected with Adware and that's a buggar to get rid of. I recently replaced my PC with a Mac after being infected with Adware. I think I picked mine up from a streaming site that I went into from CL.
I had this once and if you look in your browser settings you can see this adware as an extension(sounds very much the same) you can disable it from there
Sounds like Adware then I'm afraid. Try googling it for advice. I went round and round in circles, downloading all sorts of Adware cleaners etc. All of them a pile of doodoo. Gave up the ghost eventually. I hope you sort it out better than I could. :-)
The problem is at the start it's bearable but over time the pop ups keep getting worse and your computer will start getting slower and slower. You'll start getting pop ups telling you your computer is running too slow and advising you to download xxx software to fix it etc, etc. Starts to be a right royal pain in the bum. I gave up eventually (it was time for a new lap top anyway).
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Either way you may be infected with Adware and that's a buggar to get rid of. I recently replaced my PC with a Mac after being infected with Adware. I think I picked mine up from a streaming site that I went into from CL.
http://majorgeeks.com/page.php?id=20 scroll down and download it for free then scan your PC.
Any probs in box me.