How to Install Internet Explorer DLL or OCXby LysisUpdated September 28, 2017
Installing a DLL (Dynamic Link Library) or OCX (Object Linking and Embedding Control Extension) is normally accomplished through an executable installation. However, some add-on applications for Internet Explorer require registration of the DLL and OCX files manually. Installation of these two file types is processed through a DOS command prompt.
Download the DLL or OCX file and save them to a directory on your computer. It's important to note where the files are saved, because this path is needed for the registration process.
Click the Windows "Start" button and select the "Run" option from the menu. Type "cmd" into the text box and press the "Enter" key. Windows opens a DOS command prompt.
Uninstall the add-on using the same process but using the "-u" switch. The following is the syntax to uninstall an Internet Explorer DLL or OCX file: regsvr32 -u