The problem is that on many Windows Vista or later systems, the AnzioWin or Anzio Lite license enters OK, but does not stay around either for the next user, or in some situations, not even for the next run of AnzioWin or Anzio Lite for the same user. This problem occurs when Windows has UAC, User Account Control, enabled and it is because of various combinations of security settings. A quick solution to the problem is to run AnzioWin or Anzio Lite with elevated privileges when entering a serial number and license code for your product. To do this, follow these steps: a) Close all current running sessions of AnzioWin or Anzio Lite. b) Right-click with the mouse on top of the AnzioWin / Anzio Lite desktop shortcut and select "Run as Administrator". c) Re-enter your license information. Even if it does not ask for it, go to the Help menu and "Enter license" and do it once more. d) Close down AnzioWin or Anzio Lite and restart it normally. This should allow the license information to be accessed for all users with elevated privileges. Even though you may be logged in as an Administrator, this is the only way to make it stick on many Windows Vista and later release machines.