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In order to install .NET 3.5 you must go to the Server Manager and then select roles and add roles. <br />
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<a href="http://beyondrelational.com/blogs/brumedishetty/archive/2010/03/18/installing-net-3-5-framework-in-windows-server-2008-r2.aspx" rel="ugc">http://beyondrelational.com/blogs/brumedishetty/archive/2010/03/18/installing-net-3-5-framework-in-windows-server-2008-r2.aspx</a><br />
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That is a walkthrough that shows you exactly how to do it.
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In order to install .NET 3.5 you must go to the Server Manager and then select roles and add roles.

http://beyondrelational.com/blogs/brumedishetty/archive/2010/03/18/installing-net-3-5-framework-in-windows-server-2008-r2.aspx [http://beyondrelational.com/blogs/brumedishetty/archive/2010/03/18/installing-net-3-5-framework-in-windows-server-2008-r2.aspx]

That is a walkthrough that shows you exactly how to do it.

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I have a new server 2008 r2 install. The system is setup as a file server in a workgroup.(no domain) I try to install .net 3.5 and get an cannot install software use role management console.
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I have a new server 2008 r2 install. The system is setup as a file server in a workgroup.(no domain) I try to install .net 3.5 and get an cannot install software use role management console.

role management console error

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.