That sounds like malware to me. Try downloading, installing and running the free version of Malwarebytes Anti-Malware:
https://www.malwarebytes.org/free/
Points to note:
When installing that program, take care to deselect the option to install a trial of the 'PRO' version.
When running it, use the 'quick scan' option (which is actually likely to take over half an hour to run).
When the scan is complete, click the button to view the results and then click to delete whatever has been found (after ensuring that there's a tick alongside every item in the list).