How to Fix 'Class Not Registered (0x80040154)' COM Exception?

Resolving COM exception: Class not registered (0x80040154)

When trying to instantiate a COM class, an exception occurred with the message "Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))". This error means that the COM component is not registered in the system registry. To resolve this issue, please follow these steps:

1. Verify assembly architecture

Ensure that assemblies targeting COM components are compiled using the same architecture. If the exception persists after reinstalling the COM component, try changing the assembly architecture to x86.

2. Register COM component

Open an elevated command prompt and navigate to the directory where the COM component is located. Run the following command to register the component:

<code>regsvr32 YourComponentName.dll</code>

Replace "YourComponentName.dll" with the actual name of the COM component.

3. Grant access to registry keys

Make sure the logged in user has sufficient permissions to access the required registry keys. Grants the user ownership of:

<code>HKEY_CLASSES_ROOT\CLSID\{YourComponentGUID}</code>

Replace "{YourComponentGUID}" with the GUID of the COM component.

4. Enable debugging

Enable debugging to see more detailed error messages. In Visual Studio, select the Debug menu and click Attach to Process. Attach to the process where the exception occurred. This will allow you to step through the code and identify the specific cause of the error.

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