COM Exception: 0x80040154

I see the following error from my .NET application logs:

Retrieving the COM class factory for component with CLSID {4AD00293-551B-11D1-AEA1-0004ACB678AD} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

I believe this error arises due to the non registering of some DLL. How do I register a DLL and how can I find out what DLL is it trying to find