There is no way to use it as a webcam because of driver issues. But there may be a few workarounds to try (I can't guarantee these, obviously):
You can try a utility called WebCamDV, which tricks Windows into believing your camcorder is a webcam (free demo, $20 for full version). Downside, it's firewire. So you'll need to connect your camera via analog either into your capture card that way or through a bridge like those made by Pinnacle.
Another one is called TrackerCam DV Driver. Same, about $20. There are some wonderful bonus features included in DVdriver, too, that are worth the price of admission in themselves, if you need them.
However, you will probably need to use a separate microphone because the beef is that programs like these don't recognize the audio from the camera.