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Jan 21, 2016 9:57 AM in response to wheels030by John Galt,There is no need to buy, download, or install any product to eradicate adware, regardless of the source — Mac App Store or anywhere else. Generally speaking you should avoid anything claiming to "clean" your Mac.
For a description of how this may have occurred, how to avoid it in the future, and for Apple's recommended actions read How to install adware. Apple's instructions are linked in the Recovery Procedure near the end of that document. Read and follow them carefully. Pay particular attention to the easily overlooked passages directing you to restart your Mac when required.
Review your Gatekeeper settings: OS X : About Gatekeeper - Apple Support. Gatekeeper is designed to help prevent you from inadvertently installing garbage software.