Adding Blocks of Explanatory Text in a format that looks like scrolling writing using Movie Maker

I'm making an explanatory tutorial - and I'd like to add blocks of explanation text that looks like someone is writing the text instead of the text itself just appearing. I'm using Windows Movie Maker.

Is there a way to do this - or a plugin that one can install that allows this?

I'm considering trying it in PowerPoint and then using encoder to screen capture the PowerPoint Show and then adding this video clip to Movie Maker.

But I thought there maybe a way to do this with just using the images and adding the text effect in Movie Maker.

Thanks in advance.