For the last week, every time I go online I get annoying pop-up ads and warning messages sayying' you're computer may be infected with malware and viruses, click here... " . Also, one of the pop-up ads is a virus scan. When I try to close them, I have to click close about ten times to get rid of them all. Is this a virus? I disabled all add ons, and have done a scan with antiver, but it's still happening.