I can't view or extract photos from my SD memory card!!!?

I took pictures in my camera using this SD memory card, lets call it card A. It was working just fine. I took it out to take pictures with another SD card, lets call it card B. When I put the card A back in, the camera screen says "memory card is unusable". I can't even view the pics I took!! I've tried inserting it in other cameras, and for some reason, they all say "memory card is unusable" or "memory card is locked" even though it isn't. I can't playback the photos or videos that were in it.

What's going on here? I really want to upload the pictures from card A to my computer but the card won't let me. Is there a place I can take it to where they can somehow salvage the pictures that are still in it? The card isn't even full yet, so I'm really confused as to why this is happening. Help please, I really want those pictures ;[
 
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