I branched your comment to a new post as it's slightly different than the OP from the other topic. Your subsequent post, about using malware bytes wasn't branched along with this comment because it was a reply to the OP, not your comment. Had it been a reply to your first post, it would have been branched as well.
Unfortunately, it sounds like a fake/malicious Flash Player installer was used as www.serach.searchpost.net isn't an optional offering for the official Flash Player installer. Along with running malware bytes, I would run a full system scan (virus, adware, etc).