I may be a few days ahead of you. I'm guessing you have WinXP service pack 2 installed as I do. The only freeware I found that could play the live feed from the camera in HDV mode was VLC Media Player (fka Video Lan Client at
www.viedolan.org) and the older version 0.7.2 at that. The current version of VLC Client (0.8.1) plays the image but it is badly pixelated. I tried everything I could think of on two computers and never got 0.8.1 to work correctly.
VLC Client recognized the AV/C Subunit. Use File|Open Capture device, then refresh, and it show up in the pull down menu. It's pretty cool. You can save the image to a file. Give it a .ts or .m2t suffix and that can be read by several other media players.
You can also use VLC to stream the output from the HDR-FX1 to other VLC clients on the network, but only if you have 100 MB ethernet.
The HDTV cards MyHD 100/120/130 can upload things that are taped and see the tape unit as an D-VHS recorder.
More or less by accident after trying lots of other things my other HD Tuner a Sasem ONAirUSB tuner can play the live stream even better, and can record it. It again sees it as a D-VHS device.
There are posts where XP recognized the HDR-FX1 (or can be caused to be recognized) as a D-VHR device. I simply could never do that and I suspect that was pre-SP2 behavior.
I hope others can add to the list but that's what I have found so far.
-Jon