unable to see photos on SD card

-My camera's SD card got some sort of a virus from a friend's windows machine (**** you windows) and now I am unable to see the photos on the card when I insert the SD card into my MBP's card reader. they are not hidden just invisible.

-The photos are still on the card because I can access them on the camera and also by inserting the SD card in the card reader and using the software that came with the camera.

-Howerver in finder it shows '0 items' even though 'Get info' shows that some space is being used and availabe space is 14GB out of 32.

-I have already backed up my photos using the canon software, but dont want to delete the photos from the SD card.

-The card was scanned on a clean windows machine, a trojan virus was found and removed and the problem wasn't solved.

-Is there a way or a software that can resolve this on a mac or even a windows machine, or there is no hope and I have to format the SD card.

Thanks.