Install .NET 3.5 on Windows 8

If you're having troubles installing .NET 3.5 on to Windows 8, here's a quick tip that may solve your problem.

Make sure your Windows 8 installer disc is in your drive (or mounted/copied somewhere), then from an elevated command prompt run this command:

dism.exe /online /enable-feature /featurename:NetFX3 /Source:d:\\sources\\sxs /LimitAccess

Replace d:\ with the drive/path to your local sources.

Solution via: "I am unable to install .net 3.5 on windows 8" on Technet Social

As a sidenote, I needed .NET 3.5 for SQL Server 2012.