Typically the 4 pin connector is TINY - like the head of two pins tiny.

It can be labled iee1394, iLink, or FireWire depending on your manufacturer. Replacement cables can be found at places like Best Buy for probably $15-$20 (a rip off but what ya gonna do).

The programss Jorge linked to are what I was trying to find for you - if you have a 1394/iLink/FireWire connection on your PC, once you get the cable you should be good to go.

BTW - this is the cable you probably need:



The connector on the right is the mini FW connector.

Firewire article: http://www.colby.edu/lrc/help/firewire.html