Windows Error: "Not used. To be removed."

Description

The error message "Not used. To be removed." is a placeholder string used by software developers (including Microsoft) to mark legacy code, deprecated registry keys, or outdated system variables that are scheduled for deletion. In Windows, this error typically appears in the Event Viewer (often associated with Windows Update, Task Scheduler, or Device Installer) or as a pop-up when an application tries to call a system function or a driver property that has been phased out in a recent Windows Update. It indicates that the system is trying to execute a configuration path or read a registry value that is no longer supported or active.

While the error message looks like an incomplete developer note, it can cause background processes to hang, trigger constant error logging, or prevent certain legacy applications from launching.

Step-by-Step Easy Fixes

Follow these steps in order to resolve the issue.

Step 1: Run Windows Update Troubleshooter

Since this error often stems from deprecated Windows Update components or corrupted system files after an update, the built-in troubleshooter can automatically reset these paths.

1. Press the Windows Key + I to open the Settings app.
2. Click on System (or Update & Security on older Windows versions).
3. Select Troubleshoot from the left or right menu pane.
4. Click on Other troubleshooters (or Additional troubleshooters).
5. Find Windows Update and click the Run button next to it.
6. Wait for the process to complete, apply any recommended fixes, and restart your computer.

Step 2: Repair System Files Using SFC and DISM

If a system update left behind broken or corrupted system files pointing to the "To be removed" placeholder, deployment tools can repair them.

1. Press the Windows Key, type cmd, right-click on Command Prompt, and select Run as administrator.
2. In the Command Prompt window, type the following command and press Enter: DISM.exe /Online /Cleanup-image /Restorehealth
3. Allow the process to reach 100% (this may take several minutes depending on your internet connection).
4. Once DISM is finished, type the following command and press Enter: sfc /scannow
5. Wait for the system scan to complete. If it says it found and repaired corrupted files, restart your PC.

Step 3: Clear the Windows Update Cache

An outdated update database can continuously trigger deprecated strings. Clearing the cache forces Windows to build a fresh update catalog.

1. Press Windows Key + R to open the Run dialog box.
2. Type services.msc and press Enter.
3. Scroll down to find the Windows Update service. Right-click it and select Stop.
4. Minimize the Services window and press Windows Key + E to open File Explorer.
5. Navigate to the following directory: C:\Windows\SoftwareDistribution\DataStore
6. Delete all files and folders inside the DataStore folder.
7. Go back one folder to C:\Windows\SoftwareDistribution and open the Download folder. Delete everything inside it as well.
8. Return to the Services window, right-click Windows Update, and select Start.

Step 4: Reinstall or Update Faulty Hardware Drivers

If the error appears when plugging in a specific device (like a printer, USB hub, or graphics card), the driver is likely using a deprecated Windows property.

1. Right-click the Start Menu button and select Device Manager.
2. Look through the list for any device displaying a yellow exclamation mark (!). If none are visible, expand the category of the device causing issues (e.g., Display adapters or Universal Serial Bus controllers).
3. Right-click the device and select Update driver.
4. Choose Search automatically for drivers.
5. If no new driver is found, right-click the device again and select Uninstall device.
6. Restart your computer. Windows will automatically reinstall a generic, clean version of the driver upon reboot.