One of my customers had installed Workflow Manager 1.0 but while uninstalling it, he was encountering the mentioned below error:
This computer is part of a farm. To uninstall, first leave the farm either using 'Leave from Farm' option in Configuration Wizard or Remove-WFHost cmd-let in PowerShell. 


When we tried to execute the command Remove-WFHost, we were getting the following error:
remove-wfhost : Ceritificate requested with thumbprint {GUID} not found in the certificate store



We executed the following steps to resolve the issue. 

  1. Deleted the following registry hives: 

HKLM\Software\Microsoft\Workflow Manager
HKLM\Software\Microsoft\Service Bus

        2.  Deleted the following databases:


       3.  Uninstalled CU1 for Workflow Manager 1.0 and CU1 for Service Bus 1.0 from Control Panel

       4.  Uninstalled Workflow Manager 1.0, Workflow Manager Client 1.0, Service Bus 1.0 and Windows Fabric in the order mentioned (Refer:

       5.  Rebooted the machine hosting WFM 1.0

Written by:
Kshitij Dattani

Reviewed by:
Shashidharan Krishnan 

Microsoft India GTSC