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Windows NT reports a single processor after you apply a service pack

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Article ID:168132
Last Review:November 1, 2006
Revision:2.2
This article was previously published under Q168132

SYMPTOMS

After you apply a Windows NT service pack on a multiprocessor system, you find that Windows NT now only reports a single processor installed.

Prior to installing the service pack, you were running with multiprocessor versions of the Hal.dll and Ntoskrnl.exe files.

Applying a Windows NT service pack on a multi-processor computer may cause the computer to stop responding (hang) on reboot immediately after the installation. This may occur during the logon sequence and can appear to be a service or device failure.

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CAUSE

When Windows NT was originally installed on the computer, it may have contained only a single processor and later had a hardware upgrade to multiple processors.

On Compaq computers, you can upgrade Windows NT to support multiple processors by using the Compaq Software Support Diskette (SSD) and Choosing the Multiprocessor support option. This installs the necessary files to support multiprocessors.

Alternately, the Windows NT Resource Kit utility called Uptomp.exe allows you to upgrade Windows NT to support multiprocessors.

The problem is that neither of these 2 utilities, Compaq SSD or the Windows NT 3.5x Uptomp.exe utility, update the Setup.log file found in the %SystemRoot%\Repair directory.

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Note The "Windows NT 4.0 Resource Kit" does correctly update the Setup.log file.

The Setup.log was created when Windows NT was first installed and contains information about the files copied to your system during Windows NT setup. Consequently, the file reflects the information for a single processor computer. When service packs are installed, the Setup.log file is parsed looking for the correct Hal.dll and Ntoskrnl.exe to replace. Because the Setup.log shows single processor components, the service pack Update.exe program replaces the multiprocessor files with single processor files (thus taking you back to the single processor environment). Furthermore, additional support files are different between single and multiprocessor computers.

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RESOLUTION

By modifying the %SystemRoot%\Repair\Setup.log file, you can tell the service pack Update.exe program to load the correct multiprocessor components (thus taking you back to multiprocessor support and at the same time ensuring that future service packs install correctly).

Steps to fix the Setup.log and restore your system to multiprocessors:
1.Remove the read only and hidden attributes on the %SystemRoot%\Repair\Setup.log file.
2.Make a backup copy of the %SystemRoot%\Repair\Setup.log.
3.Open the Setup.log using notepad.
4.Search for and modify the following lines, being careful to use the correct operating system version section and proper HAL for your computer type: 
    HALSP.DLL = For Compaq Systempro, Systempro/XL, ProLiant 2000, 4000, and 4500 systems only.

    HALMPS.DLL = Multiprocessor HAL for APIC support and for the Compaq ProLiant 1500 and 5000

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Windows NT 3.5

Modify the entries under [Files.WinNt] section to the following: 
\<%SystemRoot%>\System32\Ntoskrnl.exe = "NTKRNLMP.EXE","bc81d"
\<%SystemRoot%>\System32\Kernel32.dll = "KERNEL32.DLL","65c96"
\<%SystemRoot%>\System32\Winsrv.dll = "WINSRV.DLL","1ac2a1"
\<%SystemRoot%>\System32\Ntdll.dll = "NTDLL.DLL","47eca"
Then select one of the following HALs and modify the line. 
\<%SystemRoot%>\System32\hal.dll = "HALSP.DLL","15d8d"
\<%SystemRoot%>\System32\hal.dll = "HALMPS.DLL","1b729"
Note %SystemRoot% represents the directory name where Windows NT is installed.

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Windows NT 3.51

Modify the entries under [Files.WinNt] section to the following: 
\<%SystemRoot%>\System32\Ntoskrnl.exe = "NTKRNLMP.EXE","cb271"
\<%SystemRoot%>\System32\Kernel32.dll = "KERNEL32.DLL","5d99a"
\<%SystemRoot%>\System32\Winsrv.dll = "WINSRV.DLL","155a67"
\<%SystemRoot%>\System32\Ntdll.dll = "NTDLL.DLL","5830f"
Then select one of the following HALs and modify the line. 
\<%SystemRoot%>\System32\hal.dll = "HALSP.DLL","1905a"
\<%SystemRoot%>\System32\hal.dll = "HALMPS.DLL","18039"
Note %SystemRoot% represents the directory name where Windows NT is installed.

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Windows NT 4.0

Modify the entries under [Files.WinNt] section to the following: 
\<%SystemRoot%>\System32\Ntoskrnl.exe = "NTKRNLMP.EXE","e76ab"
\<%SystemRoot%>\System32\Kernel32.dll = "KERNEL32.DLL","5b7f8"
\<%SystemRoot%>\System32\Winsrv.dll = "WINSRV.DLL","37b4e"
\<%SystemRoot%>\System32\Ntdll.dll = "NTDLL.DLL","59c19"
\<%SystemRoot%>\System32\win32k.sys = "WIN32K.SYS","132603"
Then, select one of the following HALs and modify the line: 
\<%SystemRoot%>\System32\hal.dll = "HALSP.DLL","0f337"
\<%SystemRoot%>\System32\hal.dll = "HALMPS.DLL","1a01c"
Note %SystemRoot% represents the directory name where Windows NT is installed.

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Windows NT 4.0 Terminal Server Edition

Modify the entries under [Files.WinNt] section to the following: 
\<%SystemRoot%>\System32\Ntoskrnl.exe = "NTKRNLMP.EXE","fe754"
\<%SystemRoot%>\System32\Kernel32.dll = "KERNEL32.DLL","700ee"
\<%SystemRoot%>\System32\Winsrv.dll = "WINSRV.DLL","3e526"
\<%SystemRoot%>\System32\Ntdll.dll = "NTDLL.DLL","62b31"
\<%SystemRoot%>\System32\win32k.sys = "WIN32K.SYS","140e95"
Then select one of the following HALs and modify the line: 
\<%SystemRoot%>\System32\hal.dll = "HALSP.DLL","15a34"
\<%SystemRoot%>\System32\hal.dll = "HALMPS.DLL","1a062"
Note %SystemRoot% represents the directory name where Windows NT is installed.
5.Save the modified Setup.log to the %SystemRoot%\Repair directory.
6.Reapply the service pack to take you back to MPS support.

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MORE INFORMATION

For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
124541 (http://support.microsoft.com/kb/124541/) Use Uptomp.exe to upgrade single-processor to multiprocessor
156612 (http://support.microsoft.com/kb/156612/) Using Windows NT 3.5x Uptomp.exe to upgrade Windows NT 4.0 systems to multiprocessor
148245 (http://support.microsoft.com/kb/148245/) Upgrading from uni- to multi-processor requires service pack

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APPLIES TO
•Microsoft Windows NT Workstation 3.5
•Microsoft Windows NT Workstation 3.51
•Microsoft Windows NT Workstation 4.0 Developer Edition
•Microsoft Windows NT Server 3.5
•Microsoft Windows NT Server 3.51
•Microsoft Windows NT Server 4.0 Standard Edition
•Microsoft Windows NT Server 4.0, Terminal Server Edition

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Keywords: 
kbsetup KB168132

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