Video in windows for youtube upload

[solo2]

My young son (8 years) who is turning into a computer geek wants to make a film that he can upload to youtube of him using one of his simulator games.

He watches this guy a lot so this is the sort of thing he wants to recreate.

http://www.youtube.com/watch?v=wnMI7_iCG4E

We've got a webcam and run a windows 7 pc, but he wants to be able to capture the screen shot with the computer without using the webcam to film it, but I have no idea what he needs to be able to do this. I'm guessing the webcam must come into play somehow otherwise his films with have no sound but I have no idea where to start on this and I am wary of him downloading programmes on to my pc that might contains a virus.

Has anyone any knowledge of this type of thing or do I need to find a specialised computer forum and ask those on there?

Thanks

[solo2]

Thanks Muntu,

Tried the Camstudio but it just loaded a heap of other stuff and despite watching the tutorial vid, we couldn't get it to work.

Back to the drawing board