Thanks Ed.
Here is Hans's instructions and my recommendation as well. Buenchico also provides good instructions, but can't find one of his offhand....
Download and run a scan with the Free Edition of Malwarebytes.
DO NOT agree to any trial of the Premium edition.
http://www.malwarebytes.org/
I always recommend turning off System Restore before restarting the computer after cleaning with Malwarebytes, as some reinstall themselves from System Restore.
Restart the computer, scan again. Only when it come back clean, turn on System Restore.