Class not registered error

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Hi,

I have an application that was written maybe 10 years ago. Runs fine on a xp machine. When I install it on windows 10 it runs but get the following error: retrieving the com class factory for component with clsid failed due to following error: 80040154 class not registered.

The application was written in VB.

I installed older .net versions in a hope it would help but did not. Would I be missing a DLL file and if so is there a way to find out which one I need to register?

Thanks
Fergus

What I have tried:

Installing older .net versions and installed office.

Posted 22-Jun-22 7:45am

Member 11478798

Updated 22-Jun-22 9:29am

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0x01AA 22-Jun-22 13:55pm

Your app tries to instantiate a COM class which is not registered. Either...
a.) It is something like a third party component. In this case you need to install it.
b.) It is a COM component of your own app, which will be used finally by your app. In this case there is a chance that your app tries to register the component. Simply start your app one time 'as admin' to give your app a chance to register it's own COM component.

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OriginalGriff · Answer 1 · 2022-06-22T09:29:00

In addition to what 0x01AA has said, also check the mode of the DLL: given it's age and target OS it's almost certainly a 32bit DLL - and unless your app is also compiled for 32bit it won't work as you can't mix the two unless the DLL is data only - no code will work, so the class probably won't be registered.

It may be possible to rebuild and install the DLL as 64bit, but that'll depend on the code.