Fix: Component ‘MSCOMCTL.OCX’ or One of Its Dependencies Not Correctly Registered

The “Component ‘MSCOMCTL.OCX’ or one of its dependencies not correctly registered: a file is missing or invalid” error appears when a program tries to load the MSCOMCTL.OCX control, but Windows cannot use it properly. In most cases, this happens because the file is missing, not registered, corrupted, or being loaded with the wrong 32-bit/64-bit configuration.

MSCOMCTL.OCX is a legacy Visual Basic 6.0 runtime control supported by Microsoft on supported Windows versions. It is still used by some older apps, especially legacy business software and classic Office/VB6-based tools. If Windows cannot find or load this control correctly, the program may fail to launch or install.

Before applying the fixes below, first check whether you are using a 32-bit or 64-bit version of Windows. This matters because MSCOMCTL.OCX is a 32-bit control, so its location and registration method differ depending on your system architecture.

1. Press Windows + S, type System Information, and open it.
   
2. Check the value next to System Type, then follow the appropriate steps below.
   

1. Repair or Reinstall the Program First

Before manually registering the control, try repairing or reinstalling the application that shows the error.

This is the safest approach because the message mentions “MSCOMCTL.OCX or one of its dependencies”, which means the issue may involve more than one file.

Reinstalling the program often restores the control together with the exact runtime files it needs.

If the program is already installed, use its built-in Repair option if available.

Otherwise, uninstall it, restart your PC, and install it again using a clean installer from the software vendor.

If Windows blocks the installer or says it cannot open the file, see how to fix the “Windows Cannot Access the Specified Device Path or File” error.

2. Register MSCOMCTL.OCX Manually

Use this method only if MSCOMCTL.OCX is already present on your PC. If the file is missing entirely, skip to the next section.

For 64-bit Systems

On 64-bit Windows, MSCOMCTL.OCX should normally be located in:

C:\Windows\SysWOW64

1. Open File Explorer and go to C:\Windows\SysWOW64.
2. Confirm that MSCOMCTL.OCX exists in that folder.
3. Type cmd in Windows Search, right-click Command Prompt, and choose Run as administrator.
   

Now run this command:

regsvr32 %SystemRoot%\SysWOW64\MSCOMCTL.OCX

After the registration succeeds, restart your computer and check whether the app opens normally.

For 32-bit Systems

On 32-bit Windows, the file should normally be located in:

C:\Windows\System32

1. Open File Explorer and go to C:\Windows\System32.
2. Make sure MSCOMCTL.OCX exists in that folder.
3. Open Command Prompt as administrator.
   

Then run:

regsvr32 %SystemRoot%\System32\MSCOMCTL.OCX

Restart your PC after registration and test the program again.

3. Install Microsoft’s Official Visual Basic 6.0 Common Controls Update

If the file is already present but still does not load properly, install Microsoft’s official Visual Basic 6.0 Common Controls update. This package updates MSCOMCTL.OCX and COMCTL32.OCX, which can help when the currently installed file is outdated or damaged.

After installing the update, run the correct regsvr32 command again and restart your PC.

Important: Microsoft’s package updates the control only if it already exists on the system. It does not install MSCOMCTL.OCX on a PC where the file is completely missing.

4. If the File Is Missing, Avoid Random OCX Download Sites

If MSCOMCTL.OCX is not present in the correct folder, the best fix is to reinstall the program that needs it or obtain a fresh installer from the software vendor. Avoid downloading standalone OCX files from random websites, because they often provide the wrong version, incomplete files, or potentially unsafe downloads.

If the error you are seeing points to a different legacy OCX component, you may also want to check our related guide on how to fix the COMDLG32.OCX missing error on Windows.

5. Check for 64-bit Office Incompatibility

If this error appears inside Excel, Access, or another Office application, the issue may be caused by Office architecture rather than a missing file.

According to Microsoft’s 32-bit and 64-bit Office compatibility guidance, native 64-bit Office apps cannot load 32-bit ActiveX controls.

Since MSCOMCTL.OCX is a 32-bit control, simply registering it will not fix the problem in a 64-bit Office environment.

In that case, you will need a vendor-supported alternative, an updated version of the app or template, or a compatible 32-bit Office workflow.

Note: If Regsvr32 returns an error such as “The module failed to load” or “The specified module could not be found”, the problem is often a missing dependency, an incorrect file path, or an attempt to register the control using the wrong 32-bit/64-bit Regsvr32 version.