Flash 8 sound

HI All
i use flash 8,
in my work i play a short cut of song through network using LoadSound(url,eventStream),
but :-/ when i put the viewer in to html and try to play sound
1-press the play button
2-it load the song from the network
3-and play button returnd to pause status with out playing the sound
4-when i press pause and press play again sound run

there is a thing ,this problem don’t happen to all comuters in my work , it happen to some of them
sound play in my computer from the first time but run from the second time in my Leader’s Computer .
why this done?i need a solution for this.
for more information about my Problem my Viewer is played on
http://www.nemra1.com/Public/MusicPage.aspx ,try to see it .