Problems installing SQL Server 2005 with IIS 7

Overview

When I install SQL Server 2005 Enterprise on Windows Server 2008 with IIS 7, I was warned that "Microsoft Internet Information Services (IIS) is either not installed or is disabled". Actually this misleading warning means some features of IIS 7 are not installed, and SQL Server 2005 installation needs those features.

Reference

Problems installing SQL Server 2005 on Vista and IIS7