Lost important data on CD-RW

I use a CD-RW disk to backup my important file. Yesterday I transferred files from XP notebook to Win 98 SE desktop PC with the CD-RW disk, but lost some important folders on the CD-RW when open in WIN98SE. The files on XP were gone(Disk clean up).

请高手帮忙，怎样才能找回丢掉的文件。非常重要，谢谢！谢谢！！谢谢！！！

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