Registry Key Removal

Estimated reading time: 5 minutes

Overview

Some users have encountered a rare issue when attempting to uninstall the Interject Add-In in order to install the latest version. The issue may be with some residual registry keys associated with Interject. In such a case, doing a complete uninstall by using the installer of the same version as the installed Interject version may solve this issue. If this is not successful, a manual removal of registry keys can be done. To facilitate this last resort option, we have presented a PowerShell script to assist in locating the keys:

regkey_find.ps1

Steps to Resolve:

  1. Locate Registry Keys (use script and/or manually inspect registry)
  2. Manually Remove Registry Keys
  3. Reboot
  4. Reinstall Interject

1. Locate Interject Registry Keys

Running the Script

Run the provided script to list all Interject-related registry entries:

.\regkey_find.ps1

Note: You may need to run PowerShell as Administrator.


It will return all keys and subkeys that include "interject" in their path or name.

Example output of registry locations:

  • HKCU:\Software\Interject
  • HKLM:\Software\Classes\Installer\Products{GUID}
  • HKLM:\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Interject

These entries indicate locations that may contain leftover Interject references.

Additional Registry Locations

A particular support case revealed additional registry locations that may block successful installation of Interject when residual installer files are missing or corrupted. This issue occurred because the system believed Interject was installed, but the cached installer package (.msi) was missing, causing the installation to fail. The error in the log file was:

  Warning: Local cached package 'C:\WINDOWS\Installer\ad71cbc.msi' is missing.

The following locations might have additional entries that may need to be manually deleted:

  • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall
    (multiple Interject versions may be present here)
  • HKEY_USERS[SID Identifier]\Software\Microsoft\Installer\Products\
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData<UserSID>\Products\

2. Manually Remove Registry Keys

Open Registry Editor (regedit) and navigate to the paths returned by the script. Carefully remove any entries related to Interject.

Note: Editing the registry can affect your system. Only remove keys that are clearly related to Interject. If unsure, contact support.


3. Reboot

After removing the above keys, perform a full system reboot.

4. Reinstall Interject

After cleaning the registry, proceed to install the latest version of Interject from the official source.

Additional Registry Locations from Support Case: Interject Installation Issue

A recent support case revealed additional registry locations that may block successful installation of Interject when residual installer files are missing or corrupted. This issue occurred because the system believed Interject was installed, but the cached installer package (.msi) was missing, causing the installation to fail.

Resolution Steps To Take:

Manually search for and remove registry keys related to previous Interject installations in the following locations:

  • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\ (multiple Interject versions may be present here)
  • HKEY_USERS[SID Identifier]\Software\Microsoft\Installer\Products\
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData<UserSID>\Products\

After removing the above keys, perform a full system reboot.

Retry the Interject installation, which should then proceed without errors.

Important: These additional registry paths may not be covered by the existing PowerShell script or manual search, so administrators should manually inspect them if the installer continues to fail with cached package errors.

Additional Notes

This issue has primarily occurred when older versions of the Interject add-in were not completely uninstalled.

In most cases, this process has resolved install errors and allowed the new version to work without issue.

If the problem persists after removing registry keys, please contact us at info@gointerject.com for further assistance.