|If you're removing the memory card and using a card reader, windows should show it as another drive in 'my computer'. If that's not working then there must be a problem with the card reader, its connection or the USB port. Is the card reader compatible with the type of card you're using?|
If you're connecting the phone directly to the computer and it's not seeing it then yeah, you probably need driver support but I would expect the motorola phone tools would supply that. Or, again, it's the connection or USB port.
The pictures are probably in a specific folder on the card and that may be why the photo machine at the grocery store couldn't see anything. It may have only searched the card's root directory.