Now, it would be the best to fomat your card, as QBert suggested, but if a corruption appears later again (possible in Dingux, even on a 32 KB cluster size formatted card), you don't have to back everything up, format you card and copy everything back, cause that is to time consuming.
Just use the Windows chkdsk program. You have to access it from the command promp, then type
chkdsk [letter of the drive your Dingux SD card is inserted] /F /R /X
This fixed all corruptions I ever saw on Dingux. In general, you can't avoid corruptions on Dingux 100%, but if you use 32KB Cluster size and shut the Dingux down with Reboot or PowerOff, you can make them more unlikely. Just don't use the reset switch, while in Dingux.