My computer was purchased from Dell with the OS installed. (I have the re-install CD.) Over the past 2 months, I've received a pop up when I log on (and sometimes throughout the day) that I'm not running 'genuine Windows'. Microsoft has authenticated the software and advised a virus is causing the message. I've run the Malwarebytes Pro several times and it's not finding anything. Although I cannot locate a thread, I'm sure this isn't a unique issue. Please direct me to the appropriate forum or thread so I may cleanse my computer. Thanks!