Also, as part of that link (make sure you follow it word for word), there is a link for the Malwarebytes Anti-Malware for Mac. That is an excellent free piece of software that you should download, install, and run every so often. Here is the web page that appears when you click on that link:
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.