Thursday, March 24, 2011

Only one processor showing XP

This fix is if Windows XP is only showing one processor on a multi processor/core machine.

1. Boot to safe mode with networking 

2. Delete (or rename) the following if they exist from C:\WINDOWS\System32\
hal.dll
ntoskrnl.exe
ntkrnlpa.exe
(Check for these. They usually do not exist but delete them if they do)
halmacpi.dll
ntkrnlmp.exe
ntkrpamp.exe

3. Copy the following into C:\WINDOWS\System32\ from the files described in the bottom note.
hal.dll
ntkrnlpa.exe
ntoskrnl.exe

4. Reboot and it should fix itself the rest of the way.  

NOTE: The new files in step 3 were taken from the originals which can be found on other machines in C:\WINDOWS\ServicePackFiles\i386:
halmacpi.dll renamed to –>HAL.DLL
ntkrnlmp.exe renamed to –>ntoskrnl.exe
ntkrpamp.exe renamed to –>ntkrnlpa.exe

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