si vas a registrar un nuevo objeto debes de eliminar el registro con regsvr32 /u
Cita: Register or unregister a DLL.
Syntax
REGSVR32 [/U] [/S] [/C] [/I:[Command_Line]] DLL_Name
REGSVR32 [/U] [/S] [/C] /N /I:[Command_Line] DLL_Name
Key
/u Unregister Server.
/s Silent - no dialogue boxes.
/c Console output.
/n Don't call DllRegisterServer
/i Call DllInstall (or DllUninstall if /u is specified)
Command_Line An optional command line for DllInstall
Saludos