This document has not been formally reviewed for accuracy and is provided "as is" for your convenience.
"Retrieving the COM class factory for component with CLSID" but still can login to ALM but cannot access the extension related modules
The dll for the CIT extension is not registered which is causing this error.
Register HP ALM client from add-ins page. If that doesn't help, manually register the dll from command prompt window.
This is the syntax. regsvr32 <dll name>