you should have a few choices with this model: usb, firewire, composite a/v..this link
will take you to canon's download page for your camera,
the dvmessenger app should let you view your camera on the comp, use it for videoconferencing, and view it online, as well as remotely control it, although it may not let you transfer much.
your camera should have come with an installation cd that included digital video software. if it did not, you will have to contact canon for a replacement cd.
i would recommend downloading the product manual from the above site and checking page 134
in addition you can use the memory card to transfer files via a memory card reader on the pc, these can be picked up inexpensively at most camera and computer stores. your camera however should be fine if you are using windows xp and the usb cable for your camera.
hope this helps,