The error 80080005 is a hexadecimal error return indicating that the server execution failed. As that's an error return for a myriad of problems, there's any number of issues that can be causing it. Your best bet is to use DCOMCNFG to determine if the object is properly registered on the local machine and the instantiation location is on a proper machine. Another area that can be a problem is that you've been testing the object where it's instanciated under your user account, which has more security rights than where you moved it to. Try setting the startup account in DCOMCFG for the object to your account to see if that fixes the problem.
This was first published in May 2002