This began yesterday afternoon. The message lasts a blink of an eye so I had to capture the event with my digital camera's movie function and locate the frame in MS Movie Maker to see what it read. The message reads: "Check virus protection. Windows Defender and ESET NOD32 Antivirus 5.2 are both turned off. Tap or click to see installed antivirus applications." http://homepages.paradise.net.nz/anthon11/2012-12-16_085408.jpg I went to the Action Center. During a gnat's fart the Action Center shows my system to have no anti-virus protection, or at least that's how the OS sees it. I have no idea what is causing this problem. Enabling windows Defender will stop the blips, but then the action center also warns that having both windows Defender and NOD32 antivirus enabled will slow down the PC. How do I fix this?