Moved to Malware Discussion > Home User Assistance. This is Adware not malware.
These things arrive unnoticed as "optional extras" with other software through downloading and updating sites. Always watch carefully that something extra isn't being added to whatever it is you are looking for.
Fortunately this sort of thing is easily cleaned out.
Run AdwCleaner, linked in my signature below, last link. Look under Free Third Party Tools about halfway down.
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Sorry you may have received two notifications of reply. The board was acting up when I tried to amend my response.