Espero que me entiendan, no tengo tiempo para traducir!!

:
When I was turning my PC on, WinXp Pro O.S. a message
"Some file is missing or corrupted in c:/windows/system32/system"
I tried to restart from Win XP cd, but all the options ask me to format my HDD (loosing all what I have there) and re-installing WinXP!
What can I do to restore my system without loosing my data and not having to reinstall all the soft?