How to fix an sd "memory card error" without deleting pictures?

I took 700+ pictures all over europe and I suddenly got this error "memory card error - card locked!". Please advice what to do without losing all the pictures I took. The memory card is a SanDisk Ultra II 4 GB.

I tried using the lock/unlock button, removing the battery of my camera and turning it on/off. I also have been reading blogs online and have not found a good solution. Please help.

Thank you!

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