You must use the Role Management Tool to install or configure Microsoft .NET Framework 3.5

When trying to Install SQL Server 2008 on a Windows Server 2008 R2 machine, you get the following error:

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This error happens because Windows 2008 R2 ships with .NET 3.5.1 Framework. To install you need to enable the feature via Server Manager.

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This error will also happen with other Microsoft products that require .NET Framework as a Pre-Requisite such as Visual Studio 2008.

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