I plugged in the camera to my computer and turned the camera on. It comes up a message that says theres a new USB-unit but It cant recognize it and it just disappeared. It used to work before but then I reinstalled my PC and now it doesnt work.

I cant find the cd-rom's from Canon that came with. I have Picasa2, Canon WIA Updater Utility. But none of these works. My PC has Windows XP.

I have put it in review mode It still doesnt work. It doesnt show up on 'My Computer' as it should.