VSS2SVN cannot read a VSS database without a class factory error

Mar 5, 2015 at 8:18 PM
I can't get past:

Unhandled exception has occurred in your application. If you click Continue the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.

Retrieving the COM class factory for component with CLSID {783CD4E4-9D54-11CF-B8EE-00608CC9A71F} failed due to the following error: 80040154.

Environment: Windows7-64, with VSS 2005 and its patches. I've looked in the registry, and this is the class ID of the VSS automation DLL, which is correctly registered.