Help! Safely remove hardware

i need help!! I had no problems getting pictures from my memory card from camera..now when i put the card in it says 'safely remove hardware' and my pictures are no where to be found. i have done everything i could to try and fix it and i cannot. what did i do and can i fix it??? apparently i need step-by-step instructions. very frustrating!
 
We need to know the make and model of the camera your using. Can you still view the pictures on the camera? Have you changed anything that could have caused this?
 
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