welcome to the forum.

i suggest a boot scan, and send the files to the chest.

http://www.schmahl.net/avastbootscan.php

and do a scan with malwarebytes anitmalware to get a second opion.

http://www.filehippo.com/download_malwarebytes_anti_malware/

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

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