Crashed USB-memory

Hi, does anyone know how to get back files/information from one of those usb memory?s? This one is without securitylock, and it just seams to be unformatted. The computer does install the drivers and recognize the memory, and the letter E: is appearing in the explorer, but the memory is not accessible, (please insert the drive) is the only thing thats happening when i?m clicking on the letter. The information on the memory is rather critical form my company, so if anyone know what to do, please let me know.