files show that they are empty?

I have been using Motorola Motorokr E6 with a Kingmax 2GB micro SD in it which was given with the handset by Motorola since 10 months.I had stored some Pics,voice recordings@ some video files in the card.two days back I put the card in the lap top mmc reader it worked all fine all he files opened properly, and latter when I put it back in the phone it was detected by the phone.Now even the files that I had viewed earlier dont open & it shows that the folder is of 133gb & the files also show as they are of 5gb etc... and the names of the files are encripted and they are all empty it says and a message [Moto.exe is not accesible. The file or directory is corrupted and unreadable]....I had named this file as moto.exe , how can I retrieve those files back to normal