[Solved] How to Fix RegSvr32 Error “DllUnregisterServer failed with error code 0x80040200”

Windows users reported the RegSvr32 error “DllUnregisterServer failed with error code 0x80040200” prompt when trying to register or unregister a DLL file while installing an application that registers a DLL file automatically.

The detail RegSvr32 error message as below:

The module xxx was loaded but the call to DllUnregisterServer failed with error code 0x80040200.
for more information about this problem, search online using the error code as a search term.

模块“XXX.ocx” 已加载，但对DLLRegisterServer调用失败，错误代码为0x80040200。

Content Summary

Solution 1: Unregister the DLL file with Admin Access
Solution 2: Re-register the File after Program Installation
Solution 3: Run the OCX (OLE Control Extension) File from the System32 folder

Solution 1: Unregister the DLL file with Admin Access

Step 1: Press Windows key + R to open a Run box.

Step 2: Type cmd and press Ctrl + Shift + Enter to open up an elevated CMD prompt. Click Yes to grant administrative privileges when the UAC (User Account Control) prompted.

Step 3: Type the following command and press Enter to unregister the .DLL file manually: regsvr32 /u xxx.dll
Note: Replace the xxx with the file name of the DLL file that you are attempting to unregister. For example, regsvr32 /u cdo32.dll command.

Step 4: Restart the PC.

Solution 2: Re-register the File after Program Installation

Step 1: Open File Explorer and navigate to the location of the installer that causing this error.

Step 2: Right-click on the installer and choose Run as Administrator from the context menu.

Step 3: Follow the on-screen instructions to complete the installation. Click on the OK button when the same 0x80040200 error prompt and move down to the next step.

Step 4: Press Windows key + R to open a Run box.

Step 5: Type cmd and press Ctrl + Shift + Enter to open up an elevated CMD prompt. Click Yes to grant administrative privileges when the UAC (User Account Control) prompted.

Step 6: Type the following commands and press Enter after each command to unregister and then re-register the OCX dependency:
spr32x30.ocx /UNREGISTER
spr32x30.ocx /REGSERVER

Step 7: Restart your PC.

Solution 3: Run the OCX (OLE Control Extension) File from the System32 folder

Step 1: Open File Explorer, navigate to the location of the .OCX file.

Step 2: Right-click on the .OCX file and choose Cut from the context menu.

Step 3: Navigate to C:\Windows\System32 and paste the .OCX file inside.

Step 4: Repeat the installation again.