RECOVER DELETED DIGITAL PHOTOS AFTER REFORMATTING

Question

I GOT A CAMERA FOR CHRISTMAS AND A MEMORY CARD. I HAVE TAKEN PICTURES SINCE THEN AND NEVER DOWNLOADED THEM TO A DISK. THE OTHER DAY, I TURNED MY CAMERA ON AND IT SAID IT NEEDS TO BE FORMATTED. I TRIED TO PUT IT IN MY COMPUTER AND IT SAYS THE SAME THING. IF I REFORMAT IS THERE ANY WAY TO GET THEM BACK GUARANTEED?