You really want to get this applied ASAP then… Windows RT, Windows 8, and Windows Server 2012 update rollup: July 2013 http://support.microsoft.com/kb/2855336 Specifically for Active Directory database becomes corrupted when a Windows Server 2012-based Hyper-V host server crashes http://support.microsoft.com/kb/2853952 joe Rating 4.33 out of 5