We recommend you read the Release Notes and Readme before installing SQL Server Enterprise Evaluation.

SQL Server 2008 Enterprise Evaluation is available as an image file that contains X86, X64 and IA64 installable versions. You can use this image to burn your own DVD.

You may also download a self-extracting executable (EXE) that is specific for X86, X64 or IA64. These executables do not support X86 installations on 64-bit versions of Windows. Use the DVD image for X86 installations on 64-bit versions of Windows (IA64 is not supported).