Several free options are available for PC users who need to create recordings of presentations to submit to a course.
Two simple and reasonably easy-to-use apps are SnagIt and Screencast-o-Matic. Each offers options for recording screencast, webcam, and audio.
SnagIt Home Page: https://www.techsmith.com/snagit.html
Screecast-o-Matic Home Page http://screencast-o-matic.com/home
VoiceThread is another free tool that is more of a presentation-style option. It is not a screen recording tool, but it is a tool that allows you to build and record a presentation within it, using slides you've created that you can navigate through.
Additionally, there is a Chrome browser extension called Screencastify that can record anything within the browser, such as a Google Slides presentation or a Prezi.
Screencastify (you must be using the Chrome Browser to install and use this tool): https://www.screencastify.com/