Regsvr32.exe usage
RegSvr32.exe has the following command-line options:
Regsvr32 [/u] [/n] [/i[:cmdline]] dllname

/u - Unregister server
/i - Call DllInstall passing it an optional [cmdline]; when used with /u calls dll uninstall
/n - do not call DllRegisterServer; this option must be used with /i
/s – Silent; display no message boxes (added with Windows XP and Windows Vista)