Can not find System.Windows Assembly

Question

This is the error we get:

Error 1 The type \'System.Windows.Point\' is defined in an assembly that is not referenced. You must add a reference to as

Answer 1

I had the same problem, however it was caused because we are using a Portable Class library and only occurred on certain PC installations.

I found the issue to be fixed on these installation with:

http://www.microsoft.com/en-us/download/details.aspx?id=3556

As this fix is included with VS2010 and Windows Update it would only occur on certain PCs.