If it isn't being detected via a card reader on your machine then it's pretty much belly up for that device though if you do get it to run you can try and use
Recuva, a freeware, to see if the data can be retrieved. There must also be a small bit info I'd like to pass on, please make sure your ciritical data is always backed up since the manufacturer gives you a warranty on device/hardware and not on the data that's on it(if we're talking about storage media).