Not sure what a parallel USB wire is...both are types of connections, but they are different.
Parallel port connections are pretty much in the past but they still work. Those were common with Win 9x systems, while USB connections are common with newer external peripherals (printers, scanners, etc.).
The Help menus for XP provide info on the various types of connections that allow file exchange between systems.
You might consider posting your networking issue at the BC Networking forum, http://www.bleepingcomputer.com/forums/f/21/networking/
If you like, I can ask a staff member to move this thread to that forum...or you can just start a new post there. Whichever.