The message wants to have me down load a virus remover from Google. The site is androidhelpa.xyz. Is this a valid message and if not, how do I get rid of it?
Welcome to Android Central! That's a good guide to read. What you're seeing is almost certainly a bogus popup ad that is meant to scare you into installing a "security" app that is most probably malicious itself. DO NOT DOWNLOAD ANYTHING it tells you to. The popup is probably associated with the site you're visiting, so I'd avoid that site.