If you have multiple hardware profiles configured, an option labeled "None of the Above" is included in the list of hardware profiles when you start your computer. If you select "None of the Above," Plug and Play enumeration occurs, and some devices may be reset to configurations that the drivers configured in the hardware profiles cannot support. When this occurs, you may have to manually reload the original device drivers.

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This issue is resolved by the following updated file:

Windows 95 version 4.00.950 (retail release) and 4.00.950 A (Service Pack 1):

   Io.sys dated 12/22/97 5:53pm   223,230 bytes
				

Windows 95 version 4.00.950 B (OEM Service Release 2 and 2.1) and 4.00.950 C (OEM Service Release 2.5):

   Io.sys dated 12/22/97 6:10pm   214,918 bytes
				

Windows 98 version 4.10.1998 (retail release):

   Io.sys dated 05/21/99  05:13p    222,456 bytes
				

Refer to the following article for information on an update for Windows 98 Second Edition that fixes the problem described in this article:

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WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

This update replaces the hidden system file named Io.sys in the root folder of the boot drive and allows you to remove the "None of the Above" option from the list of hardware profiles presented when you start your computer. The update adds the following registry key:

Key:        HKEY_LOCAL_MACHINE\System\CurrentControlSet\control\IDConfigDB
Value:      HideNoneOfAbove
Type:       Binary
Data Value: 01 00 00 00
				

To hide the "None of the Above" option, set the value as shown above. To display the "None of the Above" option, remove the value or set it to "00 00 00 00."

The update described in this article is available for Windows 98 and Windows 98 Second Edition, as described in the following Microsoft Knowledge Base article: For additional information about Windows 98 and Windows 98 Second Edition hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

For additional information about Windows 95 hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

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