I am installing MOSS 2007 w/ SP2 64-bit on a windows server 2003 sp2 64-bit server and during the configuration it failes at step 7 with the following error: Failed to provision the sharePoint Central Administration Web Application. Exception: System.Runtime.InteropServices.COMException (0x80040154): Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) at System.DirectoryServices.DirectoryEntry.CommitChanges() at Microsoft.SharePoint.Administration.SPMetabaseObject.Provision() at Microsoft.SharePoint.Administration.SPProvisioningAssistant.ProvisionApplicationPool(String applicationPoolId, Int32 identityType, String username, SecureString secStrPassword) at Microsoft.SharePoint.Administration.SPApplicationPool.ProvisionInternal(SecureString sstrPassword) at Microsoft.SharePoint.Administration.SPApplicationPool.Provision() at Microsoft.SharePoint.Administration.SPWebServiceInstance.Provision() at Microsoft.SharePoint.PostSetupConfiguration.CentralAdministrationSiteTask.ProvisionAdminVs() at Microsoft.SharePoint.PostSetupConfiguration.CentralAdministrationSiteTask.Run() at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask() I have tried making the changes suggested here: http://www.alpesh.nakars.com/blog/wssv3-on-a-dc-3/ but it made no difference. Any ideas? Do I need to make an special IIS configuration changes before installing MOSS in a 64-bit as opposed to a 32-bit install? Thanks in advance