question about replacing corrupted file in windows 7

hi,

I read in windows 7 bible that if a system file is corrupted , I can replace it with system recovery tool (at command prompt) if I have onother computer with windows 7 installed. 

my question is here , if I replace any file with copy the file from computer to dvd and replac it on my computer ,  does the windows version must be the same for 64 bit or it doesn't a matter.

thanks

johan

h.david