Try running these programs:
MBAM free: https://www.malwarebytes.com/mwb-download/
Eset online scanner: http://www.eset.com/us/online-scanner/
Adwcleaner: https://www.malwarebytes.com/adwcleaner/
If these find one or more infections but do not fully remove them it will be wise to register with a malware removal site to receive dedicated malware removal instructions, an expert will remain with you throughout the process until confirmation that your PC is 100% clean.
Malwarebytes virus/malware removal forum:
https://forums.malwarebytes.com/forum/7-windows...
Bleeping computer malware/virus removal forum:
https://www.bleepingcomputer.com/forums/forum22...
Disclaimer - This post contains reference to non-Microsoft websites and there may be ads on the page for products & services including products frequently classified as a PUP (Potentially Unwanted Product). Please thoroughly research any product / service advertised on the page before you decide to use them. Your discretion is very much advised.