Register DLL and OCX files:

To register .ocx and certain .dll files, it will be necessary to restart your computer in DOS 
mode and run WINDOWS/SYSTEM/REGSVR32.EXE from the command line. The following are the commands 
and switches you will need: 

regsvr32 [/u] [/s] [n] [i [:cmdline]] dll name or ocx name 

/u (unregistered server) 
/s (silent; display no message boxes) 
/c (console output) 
/i Call dll or ocx install passing it an optional [cmdline]; 
   when used with /u calls dll or ocx uninstall 
/n Do not call dll RegisterServer; this option must be used with /i