Windows Integration Errors

How to Fix Windows Script Host Error for Missing Assembly.js

John Wilson Sep 29, 2026 868 views

Question details

The user wants to stop a recurring Windows Script Host pop-up error stating that the system cannot find the assembly.js file.

How to Fix Windows Script Host Error for Missing Assembly.js

Product: Windows Script Host
Device & OS: Windows
Scenario: Starting the computer or running background tasks after installing Windows updates.
Observed behavior: Windows Script Host repeatedly displays a dialog box reporting that it cannot find the script file located at C:\Users\Public\assembly\assembly.js.

Before you start

Ensure you are logged in to your Windows computer with an administrator account, as you will need elevated privileges to modify system startup entries and scheduled tasks.

Solution 1Recommended

Use Microsoft Sysinternals Autoruns to Remove the Script Entry

Use Microsoft's advanced startup monitor to locate and safely remove the hidden scheduled task or registry entry triggering the assembly.js error.

Since standard Windows tools often hide advanced background tasks, Microsoft Sysinternals Autoruns provides a comprehensive view of all programs, scripts, and services configured to run during system boot or login.

Download Autoruns

Navigate to the official Microsoft Sysinternals website and download the Autoruns.zip archive.

Run Autoruns as Administrator

Extract the contents of the downloaded ZIP file, right-click on 'Autoruns64.exe', and select 'Run as administrator'.

Locate the Assembly.js Entry

Once the program loads, click on the 'Logon' tab and the 'Scheduled Tasks' tab. Look for any entry that references 'C:\Users\Public\assembly\assembly.js' in the Image Path.

Disable or Delete the Entry

Uncheck the box next to the identified entry to disable it. Once you confirm the error stops appearing upon restarting your PC, you can right-click the entry and select 'Delete' to remove it permanently.

Use Microsoft Sysinternals Autoruns to Remove the Script Entry

Tip: Always disable an entry first rather than deleting it immediately. This allows you to easily restore the item if you accidentally disable a legitimate Windows process.

Solution 2

Check Windows Task Manager Startup Apps

Quickly verify if the script is being called by a basic startup application visible in the Windows Task Manager.

Solution 3

Run a Full System Antivirus Scan

Ensure your system is clean, as missing scripts in the Public user folder are frequently caused by quarantined malware or adware remnants.

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Frequently Asked Questions

Why does the Windows Script Host error randomly pop up on my screen?

This happens because a scheduled background task or startup registry key is programmed to run a specific script file at regular intervals or upon login. When that script file is deleted, moved, or quarantined by an antivirus, the system throws a 'cannot find file' error instead of executing it.

Is the assembly.js file a virus or malware?

Files executing from the 'C:\Users\Public' directory are highly suspicious, as legitimate software rarely stores executable scripts there. In many cases, assembly.js is a remnant of adware, malware, or a potentially unwanted program (PUP) that has been partially removed.

Can I simply disable Windows Script Host completely to stop the error?

While you can disable Windows Script Host using the Registry Editor, it is strongly discouraged. Many legitimate Windows components, administrative tools, and third-party applications rely on the Script Host to function properly. It is much safer to use Autoruns to remove the specific orphaned task.

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