Edit

John, in addition to the CCF problem, when you get a chance take your computer off the Internet after making sure your antivirus is up to date, and run the most complete scan it has. It'll be something you start at night and leave, probably - it could take an hour or more.

This is something I automatically do when there's the slightest chance that what I'm seeing could be the result of malware. Personally on my computers I use a combination of a free antivirus program (AVG or Antivir Free are both worthy) and Malwarebytes Anti-Malware.

Chances are there's no problem on your end, but it's an excuse to check.