anybody, plz help me solve this problem!!!!

one day, when i turned on my computer, i cant get in 2 window.

my windows is win xp sp2 media center edition.

it said this file----> \WINDOWS\SYSTEM32\CONFIG\SYSTEM is missing

it said need 2 insert setup disk 2 repair. i dont have. so, i use system

recovery.everything looks fine,the desktop still there, but all cant open.

the saddest thing is all my personal files gone.

Anyone else plz help me?How do i restore my files?