MOSS 2007 setup program may crash on 64 bit Windows 2003. You can get the following error message: Setup did not complete successfully. We are sorry for the inconvenience. If it is happening with you then just check one thing: Open Terminal Services Configuration. Click Server Settings. Right-click Permission Compatibility, and then click Properties. Select the Full Security check box, and then click OK. Now you should be able to install MOSS 2007. Please note that directly changing the Terminal Services Configuration settings can be dengerous. So, be very careful before changing.