I saw an alert from my anti-virus just seconds before this screen came on that says " Your computer has been blocked" "The United States Department of Justice" . They want me to get a money pak and pay them $300.00 and get my computer unlocked and prevent further prosecution. It claims it is due to pornography of children under 18. I know this is a scam because there has been no porn viewed at all at anytime. Surely someone knows what this is and how to fix it. Conventional methods are not working. As soon as I reboot, before I can run any virus scan this whole page comes back up blocking everything. I cannot even access the task manager. Someone please help!!