you can connect via USB and Firewire. I read in Digital Video Made Easy magazine issue 16 page 19 that if you can, connect via Firewire as this will give true digital downloads, whereas the USB wont and its slower.
I have just got a JVC GR-DX77EK and have bought a Firewire card click here= and its works fine with no problems installing on XP home.
I am going to Brussels next weekend so will give the DVCam a good blast and hopefully get some good results.
Hope this helps.