Error Flash 7 player!

I’m working at one the tutorials from“Grid effect”(that one for Mx version over a picture).When I’m trying to test my movie I get the following error:

“A script in this movie is causing Flash Player to run slowly.If it continues to run,your computer may become unresponsive.Do you want to abort the script?”

I’m running on an XP machine,with P4 at 2.4Ghz and 512 Ram.Flash MX and I’ve installed version 7,0,14,0 of Flash player…

Any answers about this?