Agilent offers a utility that you can use to transfer the screen captures from the HP 3577A Network Analyzer to your PC. If you go to
Agilent Screen Capture 2.0, at the bottom of the screen you will see an executable that you can download. When you run this application, you will see that if the correct specified hardware and software, you can use this utility to get the screen captures from your 3577A. Hopefully this works for you!
Logan S.