Welcome to the forums!
Yes, I realize that sophistikat already said that, but I wanted to feel important.
About the crashing issue, that's probably because your computer can't handle that much information being handled at once, so it gives up.
I had the same issue on my old PC, but I upgraded to an iBook G4 (an Apple computer).
I've had it since December-January sometime, haven't even had a program freeze, no reboots, no viruses, no worms.
Sorry, I'll stop bragging now.
For a first flash animation, not bad.
I posted my first animation on Newgrounds and it got blammed because some guy didn't like the background. It's a harsh world out there...
But I was wondering why you have the same swf twice on the same page....