Modifying Your CONFIG.SYS and AUTOEXEC.BAT Files Yourself
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When you set up Windows, Setup usually places the HIMEM.SYS,
SMARTDRV.EXE, and EMM386.EXE files in the Windows directory.
If the Windows directory is on a disk that is not available
when you start your computer, such as a removable or nonlocal
disk, or if Setup detects one of the following conditions,
Setup does not modify the CONFIG.SYS or AUTOEXEC.BAT file:

- Your boot drive has been modified by a disk-compression
  utility.

- Your CONFIG.SYS file contains references to block device
  drivers.

- There is not enough available space on your hard disk to
  copy the files.

- The files are already installed on your system and Setup
  cannot overwrite them (they are read-only).

Instead, Setup writes proposed changes to the CONFIG.WIN and
AUTOEXEC.WIN or the CONFIG.00x and AUTOEXEC.00x files.
In this case, you must either move the HIMEM.SYS, SMARTDRV.EXE,
and EMM386.EXE files to a drive that is available when you start
your computer, or use a text editor to modify your CONFIG.SYS or
AUTOEXEC.BAT file so that any references to HIMEM.SYS,
SMARTDRV.EXE, and EMM386.EXE appear after the device=
command line used to load the drivers for your disk drives. Refer
to the CONFIG.WIN and AUTOEXEC.WIN or the CONFIG.00x and
AUTOEXEC.00x files for the proposed changes.


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