Microsoft KB Archive/185301

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Using "None of the Above" Hardware Profile May Reset Device Configurations

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Q185301

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The information in this article applies to:


 * Microsoft Windows 95
 * Microsoft Windows 95 OEM Service Release, versions 1.0, 2.0, 2.1, 2.5
 * Microsoft Windows 98
 * Microsoft Windows 98 Second Edition

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IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SYMPTOMS
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.

RESOLUTION
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:

"Q239697 ACPI-Enabled Laptop Prompts Twice for a Hardware Profile"

STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release versions 1, 2, 2.1, and 2.5. An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

MORE INFORMATION
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT or Windows 2000, you should also update your Emergency Repair Disk (ERD).

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:

"Q239697 ACPI-Enabled Laptop Prompts Twice for a Hardware Profile" Additional query words:

Keywords : kbenv kbhw osr1 osr2 win95

Issue type : kbprb

Technology : kbWin95search kbWin98search kbWin98SEsearch kbOPKSearch kbWin95 kbWin98 kbWin98SE kbWin95OPKOSR25 kbWin95OPKOSR210