Q: I think I have a virus of some kind.

Click here and follow the instructions, or if there’s a type of adware not covered by them on the computer, these ones. If you're willing to use a tool to remove it(you don't need to, but may find it easier), you can instead run Adware Medic; this link is a direct download.

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You inadvertently installed adware. You do not need to download or install anything to fix it.

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.

McAfee

Would also suggest removing this.

<http://www.thesafemac.com/mmg-builtin/>

You might also consider posting the EtreCheck output, it is possible you have other undesirable 3rd party additions installed

<https://discussions.apple.com/docs/DOC-6174>

No.

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