Read this first if you've installed security update 896358 or Windows Server 2003 Service Pack 1 on the machine you will be reading the installation guide on:
http://support.microsoft.com/kb/902225/

Here's the installation guide:
http://www.microsoft.com/downloads/details.aspx?FamilyId=E54BF6FF-026B-43A4-ADE4-A690388F310E&displaylang=en