How to solve COM Exception Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))?
You need to make sure all of your assemblies are compiling for the correct architecture. Try changing the architecture for x86 if reinstalling the COM component doesn't work.
It looks like whichever program or process you're trying to initialize either isn't installed on your machine, has a damaged installation or needs to be registered.
Either install it, repair it (via Add/Remove Programs) or register it (via Regsvr32.exe).
You haven't provided enough information for us to help you any more than this.