Ultra CF 8GB Saw pics on camera preview, won't show up on computer...

I have been using my Ultra CF 8GB card for over a year now with no problems. I just got done taking some pictures and I reviewed them on the camera. Then I plug the card into my card reader as always to upload to my computer and the pictures from my previous session come up. Even though I deleted them before my current session. So, I try to put the card back in my camera and now it says it can’t play the pictures back.

Any ideas?! I really need the new pictures as I already have the previous session on my computer. I tried uploading them anyway thinking they may be the new pictures but they upload and then just show the CR2 icon and will not open in bridge or photoshop.

HELP!

Sarah