Install Programs May Not Update Drivers with Multi-Config (96695)

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 Q96695


Many software installation programs modify the CONFIG.SYS and AUTOEXEC.BAT files. Most installation programs that modify the CONFIG.SYS file add lines to either the top or the bottom of this file. If you are using multiple configurations, these modifications may cause problems.


The most common problem occurs when an installation program updates a specific driver in the CONFIG.SYS file when multiple instances of that driver exist. Many installation programs update only the first or last occurrence of a driver. You can avoid multiple occurrences of device drivers in the CONFIG.SYS file by using a [COMMON] section.

If you include a [COMMON] block at the end of your CONFIG.SYS file, you can usually avoid problems with installation programs that add lines to the bottom of the CONFIG.SYS file.

Modification Type: Major Last Reviewed: 11/21/1999
Keywords: KB96695