Microsoft KB Archive/92785

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Err Msg: "Incorrect DOS Version" Caused by Mismatched Files

Article ID: 92785

Article Last Modified on 5/12/2003


  • Microsoft MS-DOS 5.0 Standard Edition
  • Microsoft MS-DOS 5.0a
  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.21 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q92785


If you have different versions of COMMAND.COM, MSDOS.SYS, and IO.SYS on your computer, the following error message may appear when you boot your machine:

Incorrect DOS Version

To work around this problem, you need to boot from an MS-DOS boot disk, for example, the MS-DOS Uninstall disk.


To verify the versions of MSDOS.SYS and IO.SYS, type VER at the command prompt, then type COMMAND to verify the version of the command interpreter.

If VER and COMMAND do not report identical versions and manufacturers, you must reinstall the operating system so that COMMAND.COM and the system files have the same version number and are from the same manufacturer.

Additional query words: 6.22 5.00 6.00 5.00a 6.20

Keywords: KB92785