MS-DOS Setup Displays Error: Setup Error Detected (121857)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q121857
When you are installing MS-DOS Upgrade or MS-DOS StepUp, the following
error message is displayed:
The Uninstall process of Setup displays the above error message when it is
trying to copy C:\COMMAND.COM to A:\COMMAND.DAT on the Uninstall disk.
This error occurs when COMMAND.COM is cross-linked with another file, has
allocation unit errors, or there is a bad sector on the disk.
You can correct this problem by replacing the COMMAND.COM file. Copy the
COMMAND.COM file from your DOS directory over the existing COMMAND.COM file
in the root directory using the following commands:
attrib -r command.com
ren command.com command.old
copy c:\dos\command.com c:\command.com
NOTE: If the Uninstall portion of setup is bypassed by using the SETUP /G
switch, the error does not occur. Also, using CHKDSK /F or SCANDISK may
allow you to work around this problem.
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