Sounds as though the photographic centre's machine wrote something to your card -- possibly quite innocent but in the wrong format.
I'd have a look at the CD you wrote there and see if there's anything unexpected -- if so I'd go and have a chat with the photographic centre's manager as to what they intend to do to remedy the problem.
Meanwhile if you have picture you value on the card have a look at some of the free and shareware download sites like MajorGeeks, CNET and FileHippo for a photo file recovery program. You'll need to get a card reader with a USB connection to use them -- a useful purchase anyway.
Thanx for your advise.