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We analyzed this further and noticed that this is happening if you remove the following files:

• C:\Windows\Installer\ .msi
• check-mk-agent-1.x.x-xyz.msi

Windows can't uninstall the Checkmk Agent if both files are missing from the system. So please don't remove both files.

If you're using the Agent Bakery, please keep in mind that for restoring, you need the Agent from the bakery with the same hash as previously installed on the system.

If you delete both files accidentally, you need to follow these steps for uninstalling the Checkmk Agent successfully.

Step-by-step guide

1. Remove the corresponding Registry: Computer*\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Check_MK_Agent*
   
   

2. Stop the Checkmk Agent Service

   Code Block
   language powershell theme RDark
   net stop Check_MK_Agent #(for CheckMK Agent 1.5) net stop CheckMKService #(for CheckMK Agent 1.6)

   
   

3. Remove the Directory  "C:\Program Files (x86)\check_mk"
   1. In Control Panel "\Programs\Uninstall a program" you will find one deprecated entry for Check_MK Agent
      
      
4. Download the troubleshooter for removing this entry:
   
   • https://support.microsoft.com/en-us/help/17588/windows-fix-problems-that-block-programs-being-installed-or-removed

   • Uninstall CheckMK Agent with the troubleshooter
     
     Open the uninstall program
     
     
     Click Next
     

     
     Click Uninstalling
     
     
     Select your Checkmk Agent and click Next
     
     
     Click Yes, try uninstall
     
     
     Click Close the troubleshooter
     

     
     

     
     

5. Reboot

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