Where are my System.Management.* classes?

If you're using VS 2010, switch the project to .Net 4.0. Then click on Add References, you will now see System.Management in the list (and not only System.Management.Instrumentation). You can now use the System.Management classes.

I just had the same problem, and that fixed it!

You need to add a reference to System.Management.dll to your project.

You can see System.Management.Instrumentation without adding a reference to System.Management.dll because it is included in a different library (System.Core.dll, which is included as a reference automatically), but you cannot access the other types contained by that namespace without explicitly adding a reference to the System.Management.dll library.