The source codes for the ADF4158 and ADF4159 evaluation board control software is attached below.
Warning: You use this at your own risk and it is not officially supported by Analog Devices.
The code is written in C# and the project opens in Microsoft Visual Studio. You can get a free version of Microsoft Visual C# 2010 Express here: http://www.microsoft.com/visualstudio/eng/downloads#d-2010-express
For USB microcontroller firmware source code, go here: http://ez.analog.com/message/52311
Post any questions below.