The Tip of the Night for April 13, 2018, discussed video codecs, and how to detect when Windows is missing a codec. If you don't have the necessary codec, you can download it for your system.
The example discussed on April 13th concerned a Lagarith codec. The Lagarith developer makes 32 bit and 64 bit versions available on its site. As Microsoft makes clear on its site, 32 bit codecs will not function on 64 bit operating systems.
After the zip file for the Lagarith codec is downloaded and the contents are extracted, the codec is installed by clicking on the install.bat file. You must be logged in as the administrator for the operating system in order for the installation to be completed. It's not sufficient to right click on the file and select 'Run as administrator'.