Determining If a Service Pack Has Been Installed

 Last reviewed: November 27, 1995
Article ID: Q132475
The information in this article applies to:
  • Microsoft Windows NT operating system version 3.1
  • Microsoft Windows NT Advanced Server version 3.1
  • Microsoft Windows NT Workstation versions 3.5 and 3.51
  • Microsoft Windows NT Server versions 3.5 and 3.51

To determine if your Windows NT installation was updated with a Service Pack:

  • 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).
  • Run 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

KBCategory: kbui
KBSubcategory: ntutil ntdistrib
Additional reference words: SP prodnt 3.10 3.50 3.51

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Last reviewed: November 27, 1995
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