Certain classes not registered with dll

After compiling my dll and adding it's components to a Com+ application, some of the classes in the dll don't appear to get registered. When I attempt to create these classes at run-time, I get error number 463, "Class not registered on local machine". Any ideas on what's going on here? Any help would be appreciated.

If these classes are part of a package running under COM+, then
you would need a remote server files install. If that is what you
are doing then I don't know as I haven't run into this with MTS
and still haven't tried transferring over to COM+.