CamStudio is free software which can record the screen and audio activity on your computer and create video files. It is a simple and straight-forward open source program which is completely free to use.
Its screen recording options can be customized according to your wishes. You can choose to record the full screen or a portion of it and you can also choose to record audio from microphone or from speakers. There is even an option which can produce a SWF file of your AVI recorded videos.
You may use CamStudio to create tutorials videos for any software program. You may show your friend a solution for any computer problem or show the problem itself. It even may be used to convert your PowerPoint presentations into video files.
CamStudio comes with a codec which needs to be installed first.