Thank you for the info.
Do NOT install anything new (from a pop-up or new tab) to remove a virus. The bad guys load code (malware) onto a website and when you visit it -- boom! You have a security alert that says your computer has been compromised (or something like that) and to fix it install (usually Microsoft is part of the name). Close your browser (the internet) and use your regular anti-virus scanner. Your computer should be just fine. Make sure your anti-virus software is up to date -- always! Make sure your computer is doing the regular operating system updates. Be very careful where you browse...free designs are not always free!