to format the card follow the instructions from the
manual
Unfortunately I don't think you will save what is on there if the card is playing up on more than one computer - are you sure there is data on it? sometimes it can happen that you inadvertently delete the data by pressing the wrong response to a question window that comes up.
If you are certain there is data (images) on the card, you could try to recover the data once the card has been re-formatted and is working correctly.
If you choose to do this DO NOT TAKE ANY MORE PICTURES with that card in the camera as this may overwrite the earlier images.
Download & install the free version of ZAR, available
here then follow the instructions on that page - if you have a card reader use that rather than the camera as some cameras may not be supported by ZAR
hope this helps and good luck with it :grin: