Microsoft KB Archive/231979

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The information in this article applies to:


 * Microsoft Windows 2000 Professional

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IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY
This article describes how to determine the version of Windows that was installed on your computer before the computer was upgraded to Windows 2000.

MORE INFORMATION
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

To determine the version of Windows that was installed on your computer before the computer was upgraded to Windows 2000, use Registry Editor to locate the following key:

"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\PrevOSVersion" When you click the PrevOSVersion key, values indicating the operating system, build, and other information is displayed in the right pane.

NOTE: This key is present only if the computer was upgraded from Microsoft Windows 95 or Microsoft Windows 98. Additional query words:

Keywords : kbenv

Version : WINDOWS:2000

Platform : WINDOWS

Issue type : kbhowto
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