You can use the Regsvr32 tool (Regsvr32.exe) to register and unregister OLE controls such as DLL or ActiveX Controls (OCX) files that are self-registerable. This may be necessary to troubleshoot some issues with Windows, Microsoft Internet Explorer, or other programs.

RegSvr32.exe has the following command-line options:

syntax:-   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)

 

To register a dll or ocx file :

Click Start >Type in Search Bar:

regsvr32 <path & filename of dll or ocx>

Click Enter.

for example:

To un-register a dll or ocx file :

Click Start > Run >Type

regsvr32 /u <path & filename of dll or ocx>

Click Enter.

for example: