Thanks for the response. I am using a Canon EOS Rebel Xti. I am using the Canon software for the download. I have changed out the card and used a different one and the new card works fine. I am concerned that the card is corrupted and I will lose all of the pictures. Unfortunately it is of my youngest daughters high school graduation.
I downloaded the pictures that the computer reads and then deleted them but this did not help either. The computer does not recognize the card corectly as it does not show any program to download the pictures with, in the pop up window, when I connect the camera to the computer.
Any help is greatly appreciated.