Is this known issue
Since some components are developed upon Microsoft .net Framework 3.5 SP1, if we want to install SQL Server Management Studio Express 2008 R2 on your machine, Microsoft
.net Framework 3.5 SP1 is required.
If you are using Windows 7 or above, we just have to enable it from “Turn Windows features on or off”. Please follow the steps below to enable it:
Run “appwiz.cpl” from windows run dialog
Click “Turn Windows features on or off” in the left pane
In the “Windows Features” dialog, please find “Microsoft .net Framework 3.5.1” out, then check it and click “OK”
If you are using an operating system lower than Windows 7, please download it from following link and install it:
If anything is unclear, please let me know.