PRB: KRNL386: Unable to Enter Protected Mode (105207)
The information in this article applies to:
- Microsoft Windows Software Development Kit (SDK) 3.1
This article was previously published under Q105207 SYMPTOMS
Windows 3.1 fails to boot and returns to MS-DOS with a "KRNL386: Unable to
enter Protected Mode" error message. This usually occurs after switching to
the debug version of Windows.
CAUSE
Windows 3.1 was started with old files left over from an upgraded
installation of Windows 3.0 with the Windows 3.0 Software Development Kit
(SDK).
RESOLUTION
Replace the old files with the correct versions. The files of importance
are KRNL386.*, KRNL286.*, GDI.*, and USER.*. The old files are from 1990
and the new files are from 1992. Sort by date, and replace these old files
with the correct versions.
MORE INFORMATION
It's generally a good idea to start with a fresh installation of Windows in
a clean directory when this problem occurs. This ensures that other
obsolete files are cleared from the upgraded 3.0 installation.
| Modification Type: | Major | Last Reviewed: | 11/6/1999 |
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| Keywords: | kb16bitonly KB105207 |
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