WS-FTP pro is an FTP client, not a server.
You need to set up your PC with an FTP server, ITP is good, and the free version works well, as it is deigned specifically for this task. Give it a go and see what you think.
If I was you I would set it up through your router in Infrastructure mode, as that's where I've had most success. I would therefore also connect up the other PC to your router as well, either through the wireless connection or preferably cabled.
Give it a go and let me know how you get on.