MS-DOS Upgrade Detects Current MS-DOS in Root Directory (80491)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• 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 Q80491
This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
During the MS-DOS Upgrade installation, the following message may be
Setup detected some of your original DOS files in the root
directory of your hard disk. To avoid a version conflict, you
should exit Setup and then copy your original DOS files to
a subdirectory. Then delete these files from the root directory
of your hard disk and restart Setup.
This message indicates that you must remove any MS-DOS files from the
root directory and place them in a separate subdirectory before the
Setup program can continue.
The above error message occurs because MS-DOS 5.0 tries to store the
old MS-DOS files in an OLD_DOS.X subdirectory (where "X" represents
the particular installation of MS-DOS 5.0). If the Setup program
identifies certain files in the root directory, it assumes that MS-DOS
was installed in the root.
If Setup determines MS-DOS files are in the root directory, you must
create another subdirectory (for example, C:\MSDOS) and copy the
MS-DOS files from the root into this directory. Next, delete the
MS-DOS files from the root. Note: The following MS-DOS system files
should remain in the root:
DBLSPACE.BIN ; MS-DOS 6.0 and 6.2
The following is a possible workaround to the above error message:
• Have a system/boot disk available.
• Create a new subdirectory on the hard drive. For example, type the
following at a command prompt (from the root C:\> directory):
• Copy all files from the root directory into the new subdirectory.
For example, type:
• Use the ATTRIB command to make COMMAND.COM, CONFIG.SYS, and
AUTOEXEC.BAT read-only by typing the following at the command
attrib +r command.com
attrib +r config.sys
attrib +r autoexec.bat
• Check the CONFIG.SYS and AUTOEXEC.BAT files to ensure there are no
device drivers or programs being loaded from the root directory
that are required to boot the machine (for example, Disk Manager
[DMDRVR.BIN] or Speed Store [SSTOR.SYS, HARDDRV.SYS]). If a
required device driver or program is identified, use step 3 to make
the files read-only.
• Delete all files from the root directory with the following
• Use the ATTRIB command to change the files in the root directory
back to normal to allow the MS-DOS 5.0 Setup program to access
them. Use the following syntax:
Note: Be sure to follow the above syntax to restore any device
drivers or programs to normal status.
attrib -r config.sys
attrib -r autoexec.bat
attrib -r command.com
• Run the MS-DOS 5 Upgrade Setup program.
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