Download, install update and run a complete scan with Malwarebytes (free version).
Malwarebytes.
https://www.malwarebytes.org/antimalware/
Note: decline, the "free trial" offer, just prior to launching Malwarebytes, if you are inclined to do so, but remember, accepting the offer, lauches the program in full mode and that includes real-time monitoring that may cause a conflict, if you already have another AV Product installed.
Remove any and all found objects, reboot and repeat, until there are no further detections (if any).
Next, download and run ADWCleaner.
ADWCleaner.