Microsoft KB Archive/84422

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Windows Err Msg: Unable to Enter Protected Mode

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Q84422

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The information in this article applies to:


 * Microsoft Windows versions 3.1, 3.11

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SYMPTOMS
The following error message may appear when you start Microsoft Windows version 3.1 in 386 enhanced mode:

Unable to Enter Protected Mode

CAUSE
This message is displayed if 32-bit disk access is enabled and your hard disk controller is not 100-percent compatible with the Western Digital 1003 controller card. If this is the case, the Western Digital driver does not load and the above error message is displayed.

WORKAROUND
To avoid this error message, start Windows 3.1 by typing WIN /D:F at the MS-DOS command prompt. This command disables 32-bit disk access for the current Windows session. After Windows has loaded, you can permanently disable 32-bit disk access.

To permanently disable 32-bit disk access, do the following:


 * 1) Run Control Panel.
 * 2) Choose the 386 Enhanced icon.
 * 3) Choose the Virtual Memory button.
 * 4) Choose the Change button.
 * 5) Clear the Use 32-Bit Disk Access check box.

Additional query words: fastdisk 3.10 3.11 WDCTRL fast disk

Keywords :

Issue type :

Technology : kbWin3xSearch kbWin310 kbWin311