For the last 10 days or so unsolicited web pages have opened on their own in a new Chrome tab while simultaneously,Webroot pops up with a warning against that particular website reported as being unsafe, i.e. sweetpacks/go2cloud or helpmetop.info. It can happen while I'm simply reading an email, not clicking anything. Running a Webroot scan detects no threats. I have not downloaded any suspicious shareware or the like. Any suggestions?