Microsoft Sql Server 2005 setup error There was an unexpected failure during the setup wizard. You may review the setup logs and/or click the help button for more information. Adding the group: SQLServer2005SQLBrowserUser$SERVERNAME happens to fix the issue http://social.msdn.microsoft.com/Forums/en/sqlsetupandupgrade/thread/5f2abaeb-3d28-492c-bfbe-5b53f23c7963