Cant get flash sound

Hi,

I just set up my new computer and am trying to make sure that all
components are working. I get the sound working good when playing, for
instance, music files, but then I went and tried to look at that jib
jab movie and I get no sound whatsoever. I am fairly clueless when it
comes to this...are there any browser/sound settings that should be adjusted
for 1st time use....anything else???

Thanks!!