These is list of steps that the user can do to check it:
Go to Settings. Choose Control Panel then choose Programs.
Click Turn Windows features on or off, and the user will see window as image below.
The User can enable this feature by click on .NET Framework 3.5 (include .NET 2.0 and 3.0) select it and click OK. After this step, it will download the entire package from internet and install the .NET Framework 3.5 feature.
But if the user does not have an internet connection, this steps cannot be applied.
How To Do
Insert Windows 8 DVD or mount ISO image. The source of this feature can be found in folder E:\sources\sxs. (In this case E: the user’s drive letter on which the user has loaded Windows 8 Media.)
Open CMD.EXE with Administrative Privileges.
Run the following command Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:E:\sources\sxs /LimitAccess, and hit Enter.
After completing the installation of .NET Framework 3.5 you can see that the feature is enabled.