Go read the "How to cap through firewire on Windows XP" thread over in the HDTV Recorder sub-forum.
[Note: 64 bit kiddies can stop here and keep searching.]
Uno - Connect a firewire cable between your computer and the motorola DVR
Dos - Download and install Exdues drivers & CapDVHS.
Tres - Fire up CapDVH and hit record.
It is that simple my friends.