I'm using microsoft expression to capture my video and audio output. The free version is limited to ten minutes of capturing, but that should be enough for a WoG level.

You need to use a screen recorder. By far the most popular is Fraps, but the full version costs.

I'd recommend searching "free screen recorder" in Google, then looking up some tutorials on how to use the one you've chosen.

EDIT:

I'll check that out sometime.

Expression Encoder is probably the best free screen recorder out there. I've checked several, and not many are very good at all.

Though Pixel Prospector is also a good place to look.

thank you all