its unlikely to have anything on the C drive... normally that would be stored on a small backup partition with the name 'recovery' [something like that]... have a look in disk manager [windows key] + [x]... wait a sec then press [k] on most systems
anyway should you muck about with it = no... imo your system is currently working and frankly bootrec isn't 1/2 as reliable as a fresh install of Windows however i would backup any important software/ files just as a matter of course