What does the header checksum does not match the computed checksum mean

When i start my laptop which has windows 7 I get this message "This file might be corrupt. The header checksum does not match the computed checksum". What can I do to correct this problem? Help!
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More about what header checksum match computed checksum mean
  1. When a file is written to the hdd is has a integrity value applied to it, if the file changes you get a mismatch. Normally from a virus or if the file hasn't written correctly.
  2. So what would I need to do to correct that outside of put it in the shop??
    Is there any software I could use to clean this up?
  3. At what point does that message appear? After Windows starts up?
    Before Windows starts?

    Is there a file name associated with that message?
  4. The message comes up before windows starts and there's no file name. Just the message on a black screen.
  5. Can you get far enough into Windows to do a System Recovery to an earlier date?
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