Hi,I am trying to install Exchange 2007 on a 64Bit VM.The DC is W2K8 Core 32Bit all working fine.When I install i get a -1 error.I have found the following error in the setup log files. I suspect it is .Net related.[12/03/2009 16:21:03] [2] Starting: C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\ngen.exe arguments: install "C:\Program Files\Microsoft\Exchange Server\bin\Microsoft.Exchange.Common.dll" /verbose[12/03/2009 16:21:33] [2] Process standard output: Microsoft (R) CLR Native Image Generator - Version 2.0.50727.1433Copyright (c) Microsoft Corporation. All rights reserved.Installing assembly C:\Program Files\Microsoft\Exchange Server\bin\Microsoft.Exchange.Common.dll Compiling assembly System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 ...Error compiling System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089: Internal CLR error. (Exception from HRESULT: 0x80131506) Finished compiling assembly System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 ...Failed to generate native code for dependent image System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 because of the following error: Internal CLR error. (Exception from HRESULT: 0x80131506)Internal CLR error. (Exception from HRESULT: 0x80131506)[12/03/2009 16:21:33] [2] Process standard error: [12/03/2009 16:21:33] [2] [ERROR] Unexpected Error[12/03/2009 16:21:33] [2] [ERROR] Process execution failed with exit code -1.[12/03/2009 16:21:33] [2] Ending processing.[12/03/2009 16:21:33] [1] The following 1 error(s) occurred during task execution:[12/03/2009 16:21:33] [1] 0. ErrorRecord: Process execution failed with exit code -1.[12/03/2009 16:21:33] [1] 0. ErrorRecord: Microsoft.Exchange.Configuration.Tasks.TaskException: Process execution failed with exit code -1.[12/03/2009 16:21:33] [1] [ERROR] Process execution failed with exit code -1.[12/03/2009 16:21:33] [1] Setup is halting task execution because of one or more errors in a critical task.[12/03/2009 16:21:33] [1] Finished executing component tasks.[12/03/2009 16:21:34] [1] Ending processing.Any help appreciated.... I'm just running Windows update to see if that fixes it........ &-)

ooppps Should have said it is Exchange 2007 sp 1!!

Hmmmmmmmmmmmm.... Looks like running Windows update may have done the trick...it installed .net 3.5 and seems to be flying now :-)Thanks...

Cool, thanks for the update and feedback...!!!Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com