Microsoft released a free screen recording app that's compatible with Windows 7 and 8. It's possible that the app is also compatible with Windows 10, though I haven't tried it yet. Mac users have Quicktime for free so it's not an issue on that platform.
Format used: .wmv
Editing capabilities: No
The tool is a very basic but effective. The simple controls lead to quick to learn app.
The app is small, simple, and effective. Moreover, it's from Microsoft. That may not mean much, but when it comes to free tools, I'm very cautious of the source. If there's any drawback, it's the lack of any editing capabilities