role management console error

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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Dustin99352Connect With a Mentor Commented:
Please give me my points then hehe!! :)

In order to install .NET 3.5 you must go to the Server Manager and then select roles and add roles.

That is a walkthrough that shows you exactly how to do it.
mdsmith52Author Commented:
thanks that should do it.
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