Ok , here's my problems

I was using window xp (english version) then i install the xp on top of the english version (chinese version)  but after i install the xp again , i loss all my programs and files. btw, I didn;t format before i install , i just install it over the english version.

I am just curious that if window del all those programs and files for me or ? There're some files that i really need , what can i do ? If i choose the window restore option would I be able to gain those files back again ? Or is there any software on the market today will hlep me recover those files ?

If the install formatted the DRIVE, those files are GONE. You said you didn't format, but if the files are not there I expect you did.

If they were PROGRAM files, some key portions may have gotten overwritten and would require reinstallation ofo the programs from the original source, but I think you must be talking about data files.

You can try professional data recovery services - but they are expen$IVE!!

Combining language VERSIONS like this is never a good idea, but you already know that now.