问个iPod 中文歌显示的问题,请高手指点. 谢谢

iPod worked fine for my wife, all Chinese may display in iTune and iPod correctly. However, Recently, just restalled operating system which is Windows XP professional English version, and did the same settings as before. From contral panel, regional and language, added Chinese input. now, in both iPod and iTune Chinese only display or not correct encoding. I really appreciate any suggestions and comments