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Restoring MS-DOS System Files
The MS-DOS
files COMMAND.COM, IO.SYS, and
MSDOS.SYS are necessary for the operation of your computer.
If any of these files are accidentally deleted or modified, your computer will not function. This appendix describes the
procedure for restoring these files without affecting the
applications and data files that may be one your hard disk.
Note:
IO.SYS and MSDOS.SYS are hidden files. You will not see these files if you view a directory of
C:\.
If COMMAND.COM is missing
If COMMAND.COM is missing from your hard disk, the screen displays this message during the boot process
Bad or missing command interpreter
then the computer becomes dormant. Follow the steps outfined below to restore COMMAND.COM to your hard disk.
If IO.SYS or MSDOS.SYS are Missing
If your computer is missing IO.SYS and/or MSDOS.SYS, the screen displays the following message during the boot
process
Non system disk or disk error Replace and press any key when ready
This message is repeated when any key is pressed. Follow the steps outlined below to restore IO.SYS or
MSDOS.SYS to your hard disk.
Procedure for Restoring MS-DOS System
Files
Follow these steps to restore COMMAND.COM, IO.SYS, and MSDOS.SYS.
Restoring MS-DOS Files K-1