If you can determine when this issue started, try doing a System Restore from before that date. It may remove what you appear to have been infected by.
Run a FULL anti virus scan on your system. You can also use Free Online Virus Scans
https://www.google.com.au/?gws_rd=ss...ine+virus+scan
I would also install and run Malwarebytes, Spybot and if your problem still exists have a look at Hitman Pro.
Whatever this problem is, it has been around for at least 4 years so it should be curable.