We have read several reports from users that AVG Antivirus is falsely reporting that ManyCam is a virus and this false report can block ManyCam from starting. Unfortunately this is not the first time AVG has falsely reported popular software as a virus. AVG has reported World of Warcraft, Google Desktop, and even the Windows operating system itself as a virus! If AVG has falsely reported that Windows is a virus and it damaged your computer there is a fix available here.
To uninstall AVG go to add/remove programs in the Windows control panel. There are many other free antivirus software products that are available like Kaspersky or Avast that will allow you to use our ManyCam software.