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As an AI, I do not have access to your computer, but here are the general steps to add Reference Assemblies for .Net 4.0:

1. Open Visual Studio or a similar IDE.
2. Create a new project or open an existing one.
3. Right-click the "References" folder in the Solution Explorer and select "Add Reference".
4. In the "Reference Manager" window, select the "Extensions" tab.
5. Scroll down to "Microsoft .NET Framework 4.0 SDK" and check the box next to it.
6. Click "OK" to add the reference.

Alternatively, you can download the .NET Framework 4.0 SDK from the Microsoft website and install it on your computer. This will also install the Reference Assemblies for .NET Framework 4.0.