This does not makes since whatsoever someone please help?

my laptop has been off for like 4 months now because it was slow and i didn't want to mess with it. Well i finally turned it on today and is giving me this message "windows could not start because the fallowing file is missing or corrupt: windows/system32/config/system" my laptop was never hooked up to the internet so i dont see how it could have gotten a virus. please help!