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Article ID: 124177 - Last Review: November 15, 2006 - Revision: 1.1

This article was previously published under Q124177


When you try to use Netsetup.exe to perform a server-based setup of Windows 95 on a system running Microsoft Workgroup Add-On for MS-DOS, you receive the following error:
Application Error "SUWIN caused an illegal instruction in module GDI.EXE at 0001:16EF."
NOTE: This error can also occur on systems with insufficient hard disk space to create a temporary setup directory.


This error occurs on Workgroup Add-On for MS-DOS systems configured to use the basic network redirector. When Windows 95 is set up from an MS-DOS prompt, it loads a mini-version of Windows. This version is very sensitive to system files not being accessible or loadable. The basic redirector included with Workgroup Add-On for MS-DOS may occasionally drop file handles and/or network connections. After this occurs, the mini-version of Windows fails to load code segments or resources and generates the error message.


Run Setup after starting Workgroup Add-On for MS-DOS using the full redirector. To start Workgroup Add-On for MS-DOS with the full redirector, type "net stop" (without the quotation marks) at an MS-DOS prompt and log off the system. Then type "net start full" (without the quotation marks) and log on to the system. Setup should now run without generating the error message.

  • Microsoft Windows 95
Retired KB ArticleRetired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
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