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You can use the Regsvr32 tool (Regsvr32.exe) to register and unregister object linking and embedding (OLE) controls such as dynamic-link library (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. It is also frequently used by program hacks.

1.) Copy the files you would like to register to [C:\WINDOWS\system32]
2.) Go to the command prompt Start --> Run --> cmd
3a.) To install/register the file type in: regsvr32 file.dll or regsvr32 file.ax
3b.) To uninstall the files type: regsvr32 -u file.dll or regsvr32 -u file.ax
4.) Some type of message should be displayed that says you successfully registered or unregistered the file

Extra info:
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
More information @ MS