welcome to the forum. I suggest you try a boot scan with avast and a scan with malwarebytes antimalware and see if they come up with anything, as a first step/s.

http://www.schmahl.net/avastbootscan.php -instruction on how to make a boot scan.

http://filehippo.com/download_malwarebytes_anti_malware/ link to malwarebytes.

download install update and do a scan with malwarebytes. don’t forget to remove what it finds. and a system reboot might be needed.

good luck and let us know on the progress or if you need more help.