Installation can fail due to the following Windows installer error.
Error 1603 - Fatal error during installation: The error occurs if the target host is Windows 2003 Enterprise Server with SP1. The possible causes of this error are mentioned at http://support.microsoft.com/default.aspx?scid=kb;en-us;834484.
In such case, you need to install the Update for Windows 2003 Enterprise Server SP1 from :http://support.microsoft.com/kb/898715.