Saving corrupted JPEG pictures?

I imported photos onto my computer even though they were from a corrupt memory card. I am aware that i need a new memory card, one that is compatible with my camera, but i need to get the pictures on to my computer. When they were uploaded i can tell that they are on my computer but the preview is missing and there is a lock on the bottom left of the icon. It is a JPG. i was wondering if anybody knows how i can save these pictures..please help! thank you..(there are pictures of my family vacation, including pictures with some celebrities and i, and my cousins baptism..really important!!!!!)