Try using an external card reader with a USB plug. Connect it to the computer. If one USB port does not work, try another USB port.
You may get a message saying 'Found new hardware', and shortly thereafter it will say 'Your new hardware is ready for use'. At this point, it will show up in Windows Explorer.
------------------------------All things cometh to he that waiteth - provided he that waiteth, worketh like hell while he waiteth! Reply to Ubrales