Microsoft KB Archive/74636

= A20 Hardware Error Installing Windows 3.0 on AST Premium =

Article ID: 74636

Article Last Modified on 9/30/2003

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a

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This article was previously published under Q74636



SYMPTOMS
The Microsoft Windows version 3.0 Setup program may hang on disk #2 when you install Windows under Microsoft MS-DOS version 5.0 on an AST Premium 80386 machine when the message &quot;A20 Hardware Error&quot; is displayed on the screen.



WORKAROUND
If this error occurs, check the CONFIG.SYS file for the line &quot;DOS=high.&quot; If it exists, change it to &quot;DOS=low&quot;, and remove any third-party device drivers such as ASTEMM.SYS. Reboot the machine to have the change take effect.

Begin the Windows Setup program again.

Additional query words: 5.00

Keywords: KB74636

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