After you connect to the FTP server, at the ftp prompt, enter:

PASV

You should get a response verification from the other end.

Edit:
Well, it's been a while since I did an FTP in Windows or DOS.
You might want to try an FTP client, some kind of ftp software. I'm a Linux user myself, and I use gFTP, but I doubt that's available for Windows. There should be some ftp Windows client available.