A customer of mine reinstalled their Point-of-Sales program. They are using Windows XP pro. When the program was reinstalled it had overwritten (not deleted) all of my customer's data files (.dat files to be exact) with sample data filles. Also they had never bothered to make a backup. I have tried many methods to try to recover the .dat files (i.e. customer.dat) with no success. I've attempted to recover the files with EASY RECOVER PRO & GET BACK DATA NTFS to name a few. Does anyone have any suggestions of what i might try to recover these overwritten files or any recovery programs that might be more successful in the area of recovering overwritten files? Any help would be greatly appreciated!!!