Emcomm Ops is about the only supported software out there for TNCs. You don't need screen shots since you can go the w4pc.com website and download it as a 30 day trial. If you like it, you can buy the registration code to keep using it.
I have been using it for about a month and just registered it as it works very well for me. Oh, and yes it works with Windows 7 64-bit and that is what I am using.
As an FYI - if using a serial to usb adapter, make sure you use an adapter with the FTDI (or is it FDTI?) chipset and not prolific. I have had issues with the KPC3+ and the Prolific adapters. The FTDI works fine.