computer crashed

hello my daughter has a dell latitude d610 and she tried to cutt it on and then she got a screen said  windows could not start because the folling file is missing or corrupt: /windows/systems32/conf/system.

then it saids you can attempt  to repair this file by starting windows setup using the oringinal set up cd-rom

select r at the first screen to start repair'

So what do i do and how do i fix it