Why this strange Windows 7 backup failure?


I don't understand why I'm getting this when trying to run the Windows backup tool.

An internal error has occured
The parameter is incorrect. (0x80070057)

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Can you tell me what I should do about this error?

asked on Super User May 3, 2013 by Niklas R. • edited May 3, 2013 by user

1 Answer


This knowledge base article (KB982736) suggests that the problem can be caused by having the decimal separator set to something other than .. It suggests two solutions:

  • Change the symbol back to . in control panel > region and language > formats > additional settings
  • or set HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\System\CopyFileBufferedSynchronousIo to DWORD value 1 using regedit.exe.

The KB article has more instructions on how to make the registry change.

answered on Super User May 3, 2013 by Flup

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