I have the same problem ( This pre-release version of Windows Server 2008 Enterprise will expire in 0 hours) I am getting the message above every 2 hours after which my computer reboots. My understanding is that this version of Windows Server is a prerelease version and I need to upgrade to the latest version. I installed Windows Server 2008 SP2, Build 6002 in March 2009. There is an Update for Windows (KB955430) dated 2/1/2009, but the Programs and Features Control Panel will not let me uninstall it directly. My question is whether there is some way of upgrading in-place? Mitchell Greess.