The SQL Server 2008 install requires the .NET 3.5 framework. Changes in Windows 7 can prevent SQL Server 2008 from installing the .NET 3.5 framework pre-requisite. Instead you may need to install the framework separately.
In Windows 7, the .NET Framework 3.5 is included as a Windows component. To avoid this installation failure, you must turn on the .NET Framework 3.5 from the Windows Features before you run the SQL Server 2008 RTM installation.
Alternate Method
1. Download the .NET 3.5 Framework and save the dotnetfx35setup.exe on the local drive. (http://download.microsoft.com) 2. Using Explorer access the File Properties | Compatibility tab and enable compatibility mode for Vista SP1. 3. Run donnetfx36setup.exe as ‘ADMINISTRATOR’ to complete the install. 4. Execute SQL Server setup again to install SQL Server.
1. Download the .NET 3.5 Framework and save the dotnetfx35setup.exe on the local drive. (http://download.microsoft.com)
2. Using Explorer access the File Properties | Compatibility tab and enable compatibility mode for Vista SP1.
3. Run donnetfx36setup.exe as ‘ADMINISTRATOR’ to complete the install.
4. Execute SQL Server setup again to install SQL Server.
Bob Dorr – Principle SQL Server Escalation Engineer
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Is there a typo in Step 3 of the Alternate Method?
Should this reference dotnetfx35setup.exe instead of 36?
"you must turn on the .NET Framework 3.5 from the Windows Features"
when I go to Control Panel | Windows Features I see lots of options, incl .net 3.5.1 but nothing for 3.5. where is it???
After complete installation .net Framework 3.5, I still receive Request .net 3.5 when try to install SQL 2008 Developer Edition.
Trying install .net Framework 3.5 SP1 will receive Don't Send Error.