How to Install Microsoft .NET
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In Microsoft Windows Server 2008 R2, .NET v3.51 can be installed only through the Server Manager.
1. Open Server Manager. In the Windows Start Menu select Start > Programs > Administrative Tools >Server Manager.
2.In the Server Manager interface, click on Features in the left-hand tree. Click Add New Feature' to initiate the Add Features Wizard. Select the .NET Framework 3.5.1 checkbox. Click Next.
3.Allow the installation process to complete until you see the final screen.
IMPORTANT: .NET v4 comes pre-installed with Windows Server 2012.