Hi Erik,
I’m a total novice and am experiencing the same problem with loading the P2 driver from the CD on my new pc running Vista. (I thought I would need the computer to go with my new camera and Adobe editing software, so even Vista is new to me.) I thought I found the solution like you did in the “Other Options” area of the camera when I reset to USB, but it did not do the trick. The P2 card and camera don’t even appear on the computer in Windows Explorer. A few times I even got a red warning on the monitor on the camera that says “Turn power off.” Did you ever get it working? And how? Thanks.