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

ID: Q185301

The information in this article applies to:

Microsoft Windows 95
Microsoft Windows 95 OEM Service Release versions 1, 2, 2.1, 2.5
Microsoft Windows 98

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

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.

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."


Keywords          : kbenv kbhw osr1 osr2 win95 
Version           : WINDOWS:95
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: July 2, 1999