Memory card problem

This post might belong in the digital camera section, but i couldnt find a "post new thread".
i have a Olympus digital camera -modelS-360L. I had 2 memory cards for it ina special place, so they wouldnt get wrecked. The other day I put them both in my pc. They both turned out okay, 3 days later I put them back in the pc and one of the showed nothing and the other one was okay. I inserted the blank one back into the camera and it said card error. I would like to get the pictures off the card, that said card error. Is there a way i can do that? I dont know what happened to get a card error on the memory card. Can someone please help me.? thank you jazzmine54868 :confused