Do you have a security app like one of the following that could be generating that message? * Lookout: https://play.google.com/store/apps/details?id=com.lookout * Trend Micro: https://play.google.com/store/apps/details?id=com.trendmicro.tmmspersonal * Norton: https://play.google.com/store/apps/details?id=com.symantec.mobilesecurity If not, that could be some advertising from a website that you should not trust, or a bad app you installed. Probably a good idea to install one of the security apps (but probably only one to avoid bogging down with overlapping functionality).