First off, don't follow the link in the first reply you got. It may lead to worse
problems.
Download, install and update MalwareBytes' anti-malware... run a scan. See if that
takes care of it.
Malwarebytes' Anti-Malware
If necessary, you'll need to get further help on a malware support forum. Register
and post on one of the following forums. Before posting, follow their preliminary
cleaning steps. *Post on only ONE forum.
MalwareBytes' malware removal forum
GeeksToGo forumBlocking Unwanted Parasites with a Hosts File