If you do not know how to do this, try GifCam and record system activities as GIF animation. It acts as a camera that records what is happening on your computer screen and then save it as GIF animations.
It is a portable app that comes with a easy to use interface. Run the tool and see the record are along with a menu at right side.
Click on the Rec button to start recording. If you want to capture screen frame a time manually, click on Frame. You can also edit screencast with Edit option of the tool. You can also delete any unwanted frame in screencast with edit option.
I recorded many screencast GIFs and all were perfect. See the screencast that I recorded with this nice tool.
This portable app works on all available version of Windows Operating system.
Try this nice tool and share your experience with us.