You receive the "previous version is already installed" error message when you install Project 2000 (833919)

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:

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.
   • HKEY_CLASSES_ROOT\Installer\Features\8061EFD2ACDB1D117BEA000CF49BF2D3
   • HKEY_CLASSES_ROOT\Installer\Products\8061EFD2ACDB1D117BEA000CF49BF2D3
   • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\{2DFE160-BDCA-11D1-D7AE-00C04FB92F3D}
4. On the File menu, click Exit.