To install the .NET Framework 3.5 on Windows 8/8.1

1. In Windows 8 or Windows Server 2012, open a Command Prompt window with administrative credentials (that is, choose Run as administrator).
2. To install the .NET Framework 3.5 from installation media located in the D:\sources\sxs directory, use the following command:
   DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs