I can not play audo file from this site

http://toeflpractice.ets.org/
I can not play the audio file from this site in window media player, which is in system check tab. So please anybody tell me what is the problem and why i am not able to play the audio. If some body reply me promt i will apriciate.
I have WINDOWS XP Home SP2.
Thank you
Yashwanta