File transfer help?

I have a Powerbook and an old Wintel notebook. The Wintel box has no CD burner or firewire but both computers have USB and are sharing a cable connection (wirelesly).

I need to transfer files from the Wintel Machine to the Mac. How can I do this? Can I network them with a cable through the USB ports or get the Mac to recognize the Wintel machine and share files that way?

Any ideas.