For SQL Server to install successfully, the following software components are required on the installation computer. They will be installed by SQL Server Setup:
.NET Framework version 2.0 SP2 for SQL Server Express
.NET Framework version 3.5 SP1 for SQL Server Express with Tools and SQL Server Express Advanced
.NET Framework version 2.0 SP2 for SQL Server 2008 on Windows Server 2003 (64-bit) IA64 SP1
.NET Framework version 3.5 SP1 for all other editions of SQL Server 2008
SQL Server Setup support files
SQL Server Native Client
These components are not removed if Setup fails or is canceled. To remove them, use Add or Remove Programs in Control Panel.
Installing .NET Framework 2.0 SP2: .NET Framework 2.0 SP2 is not available as a separate download. You will need to install .NET Framework 3.5 SP1 which includes .NET Framework 2.0 SP2.