Use a program called Image Recall. Go to Amazon and purchase it.
It works all the time. Has worked for me.
Do NOT reformat the card. Take the card out of your camera. Put the card into a card reader and use the software.
Imagerecall.com will do the work for you and charge you a fee if you want to send them your card also.
PC Mag,: Photo Recovery Software
Recover Lost Digital Images
#1 Rated ImageRecall recovers lost photos from memory cards, USB drives, and other removable media. The only photo recovery program to win 2 PC Magazine Editors' Choice awards. Works with any manufacturer's memory card. Available in PC and Mac versions. Special offer! Buy ImageRecall now and get an Instant $9.99 Rebate. Was $39.95 , now pay only $29.96 AND receive a free upgrade to ImageRecall 4 Don't Panic - Photo Edition version coming April 2008!
Hope this helps you.
Canon S3 IS, Kingston 2GB SD card. Memory card is full but no images can be viewed on camera. Images cannot be found to download and cannot be viewed on the computer. One date recovery program was unsuccessful. If the card cannot be read throught the PC cardreader then should it be left in the camera for the next recovery program I try? Windows XP. HP Athlon 64 X2 dual core 3800. Of course I know I can try to format the card but would like to try to recover those once in a lifetime photos first. Another memory card works fine in the camera so it's not the camera. Also works in the PC cardreader.