Registering and Unregistering COM DLLs

http://support.microsoft.com/kb/249873

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)

When you use Regsvr32.exe, it attempts to load the component and call its DLLSelfRegister function. If this attempt is successful, Regsvr32.exe displays a dialog box that indicates success. If the attempt is unsuccessful, Regsvr32.exe returns an error message. This may include a Win32 error code. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

193625  WinInet error codes (12001 through 12156)

For example, to manually register a Sample.ocx ActiveX control, type the following command at command prompt:

c:\regsvr32.exe sample.ocx