Microsoft KB Archive/833919

= You receive the &quot;previous version is already installed&quot; error message when you install Project 2000 =

Article ID: 833919

Article Last Modified on 7/27/2006

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APPLIES TO


 * Microsoft Project 2000 Standard Edition

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Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you remove and then try to reinstall Microsoft Project 2000, you may receive the following error message:

Previous version is already installed.



CAUSE
This problem occurs if all the Project 2000 registry settings were not removed during the removal process.



RESOLUTION
Use one of the following two methods to resolve this problem.

Method one
Run the Windows Installer Cleanup Utility to completely remove all the installed components of Project 2000.

For additional information about how to use the Windows Installer Cleanup Utility, click the following article number to view the article in the Microsoft Knowledge Base:

290301 Description of the Windows Installer CleanUp Utility

Method two
Remove the Project 2000 Installer and Uninstall registry keys. To do this, follow these steps:

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
 * 1) Click Start, and then click Run.
 * 2) In the Open box, type regedit, and then click OK.
 * 3) Locate each one of the registry keys that are in the following list, right-click each registry key, and then click Delete.
 * 4) * HKEY_CLASSES_ROOT\Installer\Features\8061EFD2ACDB1D117BEA000CF49BF2D3
 * 5) * HKEY_CLASSES_ROOT\Installer\Products\8061EFD2ACDB1D117BEA000CF49BF2D3
 * 6) * HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\{2DFE160-BDCA-11D1-D7AE-00C04FB92F3D}
 * 7) On the File menu, click Exit.

Additional query words: setup project already installed

Keywords: kberrmsg kbbug kbpending KB833919

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