Hi dong 1. I'm afraid that this is quite a common problem. Floppy disks created on Windows 98 or earlier often fail to work on a computer with XP. I think it is something to do with the formatting of the disk, but I have yet to find a definitive explanation of what has gone wrong, or a cure. If the data on the disk is important, then I think the best option is to use a Windows 98 computer to burn the data to CD, or copy it to a removeable USB flash drive (these are now available at reasonable prices and are excellant for transferring data between computers).