If the card is being recognised, it is more likely to do with either the camera or the cable. First Try and new cable. Have you looked to see if there are any conflicts on the computer at all, with IO and IRQ's. Usually with my experience, you have to connect the camera to the computer before you turn it on have the camera turned on as well, that way windows sees it through the connection at start up and loads appropriate drivers. With the Plug and Play side of Windows, it doesn't always work. Software confilicts will cause this type of problem.