Windows Server 2008 x64: registered dll cannot be loaded

Question

I've registered a COM dll using regsvr32 as I've always used to do, but when the code that uses this dll is fired i get the following exception:

Retrieving the COM class factory for component with CLSID {E4F35ED2-71B3-4F6D-A4A9-FAA456365819} failed due to the following error: 80040154.

I checked the error by id and it says that the dll could not be loaded. I checked the registry and the dll is properly registered - what may be the problem in this case?

Edit: the code is fired by Sharepoint.

Answer 1

Have you tried Dependency Walker? (Make sure that you get the 64 bit version)

Also, its worth noting that you will only be able to load 32 bit assemblies in a 32 bit process, and 64 bit assemblies in a 64 bit process.