Before You Install SQL Server Express
Before you install Microsoft SQL Server 2005 Express Edition (SQL Server Express), make sure that you install the correct version of .NET Framework associated with SQL Server Express.
|SQL Server Express Version||.NET Framework version|
SQL Server 2005 Express Edition - RTM
If you are installing SQL Server 2005 Express Edition, perform the following steps in order:
You can identify which .NET Framework version is on your computer in one of two ways:
If the version is 2.0, to identify the exact version, go to %WINDIR%\Microsoft.NET\Framework\version, right-click mscorlib.dll, click Properties, and then click Version.
Alternatively, on the Start menu, click Control Panel, open Administrative Tools, and then open .NET Framework 2.0 Configuration. At the top of the right pane, the .NET Framework version displays.