Well, to do what you want, just import the video using imovie on the Mac and export it as a DV video stream... I'm away from my Mac right now, so I can't remember exactly what it is called in the dropdown box when you export. ( *not* a Quicktime movie with DV codec )
Copy that file over to your PC.
Do a test first with a 1 minute clip to make sure it works.
When you go to do the whole thing, the whole file will be large ( 13GB per hour or s ) so make sure you have a fast network connection between your systems and enough space on the PC.
If you are going to do this often, you'd probably be better off just buying a firewire card for your PC... they're like $25.
Or buying Final Cut Express for your Mac.