Determining If a Service Pack Has Been Installed

This article was previously published under Q132475
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To determine if your Windows NT 3.x installation was updated with a servicepack:
  • Type winver at the MS-DOS Command Prompt.
  • Choose About Program Manager from the Program Manager Help menu.
  • Check the version displayed at System Boot during the Kernel Initialization Phase (when the screen turns blue).
  • Start Registry Editor (REGEDT32.EXE). From the HKEY_LOCAL_MACHINE subtree, view the following key:
          \SOFTWARE\Microsoft\WindowsNT\CurrentVersion				
    WARNING: Using Registry Editor incorrectly can cause serious, system- wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

    The value under Windows NT 3.5 and 3.51 is:
          CSDVersion:REG_SZ:Service Pack x 				
    The value under Windows NT Advanced Server 3.1 is:
          CSDVersion:REG_DWORD:0x300 				
To determine which service pack is installed in Windows NT 4.0, use one ofthe following methods:

Method 1

During the startup process, Windows NT displays a blue screen withinformation at the top. This information includes the version of Windows NTbeing booted, as well as the build number for that version. It alsoprovides the service pack number if any has been installed.

Method 2

From the Windows NT desktop, click Start, and then click Run. Type winverin the Open box and click OK. An About box appears, which lists what buildnumber of Windows NT you are running as well as the service pack version number.

NOTE: This same dialog box can be reached by clicking the Help menu andthen click About in Windows Explorer.

To determine version information in Windows 2000:

From the Windows 2000 desktop, click Start, and then click Run. Type winverin the Open box and click OK. An About box appears, which lists what buildnumber of Windows 2000 you are running as well as the service pack version number.

NOTE: This same dialog box can be reached by clicking the Help menu andthen click About in Windows Explorer.
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Article ID: 132475 - Last Review: 02/28/2014 07:57:18 - Revision: 2.2

Microsoft Windows 2000 Server, Microsoft Windows 2000 Advanced Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows NT Advanced Server 3.1, Microsoft Windows NT Workstation 3.1, Microsoft Windows NT Advanced Server 3.1, 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

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