How do you make your own video games

Firstly, u should install a record program, i recommend PChand Screen Capture, it could record anything on the screen and any audio you hear. even the left and right mouse clicks and mouse highlights can be recorded to be displayed in your recordings.
see the link below:
http://www.screen-capture-record.com/screen-recorder.html
Secondly, read some tutorials on how to use this kind of program, if u choose PCHand Screen Recorder, here are some articles that could help u to discover more.
http://blog.pc-hand.com/category/tutorial
Btw, the file generated using PCHand Screen Recorder is standard AVI format, u can upload it to Youtube to share with everyone.
Hope it could help u! :)