Firewire to USB

I just bought a Dell Dimension E310 and totally forgot to check into getting it equiped to use it for downloading video from my Canon ZR 65. I know I need a fire wire to do this, but does that mean I need to buy hardware for my Computer or is there anything to buy that would work? I have seen a new cord that claims to convert fire wire using the USB ports through the cable. http://www.pixela-1.com/captycable/ Does anyone know if this cable indeed works, or if there is a better option for me?

Please HELP! I really want to be able to put all the video of my little boy from the Mini DVs to my Computer. THANKS!!!