Hi, had to do a computer restore recently, up to then had Canon Ixus 60 software installed & everything worked fine but after computer restore I installed discs that came with camera, I see Zoombrowser in Programmes but when I plug lead into usb to download photos to computer nothing is happening & in control panel under scanners/cameras the screen is blank, it's like as if the computer doesn't know I've plugged in lead for camera.