Let it Snow!

Hello I was reading a tutorial on Falling Snow. I am having difficulties making a movie for a presentation. I want the Falling Snow effect in the background and want to have logos appearing and disappearing. Moreover I need to Export it to .avi and then convert it to .mpeg. The converting part I understand but when I export using the Export feature in Flash it has a single screen and nothing happens. If you have any clue as to what I am talking about please post and tell me how to get the snow to fall in the background. Thanks.