I've owned two Canon DV cameras. Neither came with Canon software for video. Anything with firewire support worked, including Windows Movie Maker, winDV, DVIO, and all the commercial video editors.
If you don't already have it, you might download the owners manual from Canon, just to make sure that your camera doesn't need a few settings enabled. For example, on my ZR85, one could set the DV port as either an input or am output.
When you plug the camera firewire cable into the PC, it is in "play" mode, and XP does that musical thunk that indicates it has new connection? If not, there's a problem. Port not enabled. Bad cable. Bad camera.
I'm on my second Canon because the firewire port on the forst one got fired. User error. It happens.