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Clean uninstall / install of OWB


Article ID: 32378


Updated On:


Clarity PPM On Premise


This article will walk a user through the steps to do a clean uninstall of Open Workbench (OWB)


Doing a clean uninstall / install is especially recommended if running into issues during an upgrade of OWB. Sometimes, due to permission restrictions or other issues on the machine, some of the OWB components do not get uninstalled on their own. If that is the case, a manual uninstall is needed to remove the remaining components.


Release: All Supported Releases


  1. Uninstall the following components from Control Panel:
    • Open Workbench (OWB)
      • Note, prior to uninstalling OWB, if you have any custom views for OWB, make sure to save these in a separate folder prior to the uninstall. 
    • CA PPM Microsoft Project Interface 
    • CA PPM Schedule Connect
    • CAClarityAddin

     2. Clean out the Registry

    • On the workstation, go to Start and type 'regedit' in the search field. Select regedit.exe.
    • Select File -> Export and enter a File Name to store the back-up of the registry just in case
    • Once finished creating a backup, delete the following keys if exist: 
      • HKEY_CLASSES_ROOT\Applications\Schedlink.exe
      • HKEY_CURRENT_USER\Software\Niku
      • HKEY_LOCAL_MACHINE\Software\Wow6432Node\Niku
      • HKEY_LOCAL_MACHINE\Software\Niku
    • Please note that some of the keys may not exist; also, deleting each key will correctly delete all of their sub keys. 
     3. Reboot the workstation

    4. Go to Add/Remove Programs again and check that there is no trace left of the products that you have removed at step 1. 

    5. Delete the following folders if they are listed (First make a backup of any views you may have saved in the folders if they are still there): 

    • C:\CA\PPM\CA PPM Schedule Connect
    • C:\Program Files\CA\PPM Setups
    • C:\Program Files\Open Workbench

      Please note that on workstations running a 32-bit version of Windows, the folder names will be prefixed with C:\Program Files (x86)\ instead of C:\Program Files\. 

    6. Reinstall OWB.

    • Ensure the version being installed is the same version and patch level as that of Clarity.
    • The OWB Version can be found in PPM by going to Home->Account Settings->Software Downloads

Additional Information

For MSP see: Clean Uninstall of the Clarity MSP Interface