Microsoft small business knowledge base

Article ID: 131663 - Last Review: December 28, 2014 - Revision: 1.1

This article was previously published under Q131663
This article has been archived. It is offered "as is" and will no longer be updated.


When you are installing Windows 95, you may receive the following error message:
Error SU0358

Setup detected one or more MS-DOS-based programs running on your computer. Close your MS-DOS programs, and then click OK to continue. Or, click Cancel to quit Setup.


Setup cannot continue while an MS-DOS-based program is running. The MS-DOS-based program may be running in a hidden virtual machine so that it is not visible when you press ALT+TAB or in the Close Program dialog box.

NOTE: Windows 95 supports running MS-DOS-based programs in hidden virtual machines (VMs). Hidden VMs do not display program windows or show up as running programs. Hidden VMs are created by the developer of a program.


To work around this problem, use any one of the following methods:
  • Press ALT+TAB to cycle through the running programs and close the MS-DOS-based program.
  • Press CTRL+ALT+DEL to open the Close Program dialog box and close the MS-DOS-based program.
  • Cancel Setup. Remove the MS-DOS-based program from the Startup group or from the Load= or Run= line in the WIN.INI file and then restart Windows.


The WinPrinter driver by LaserMaster is an example of an MS-DOS-based program that runs in a hidden VM and is not visible when you press ALT+TAB or CTRL+ALT+DEL. To disable WinPrinter, remove the WinPrinter icons from the Startup group, restart the computer, and then run Windows 95 Setup again.

The third-party product discussed in this article is manufactured by a vendor independent of Microsoft; we make no warranty, implied or other- wise, regarding this product's performance or reliability.

  • Microsoft Windows 95
kbnosurvey kbarchive KB131663
Additional support options
Ask The Microsoft Small Business Support Community
Contact Microsoft Small Business Support
Find Microsoft Small Business Support Certified Partner
Find a Microsoft Store For In-Person Small Business Support