does this sound nornal on a ford explorer?

i have a 1997 ford explorer and its running great, but 1 day ago it started making a loud whiney noise, im thinking the steering pump? here look for your self heres a video... http://www.youtube.com/watch?v=rK8k_goeG9s

does that sound right, i dont think it does it sounded different before that started, and also if its the power steering pump what do i do??

WHAT DO I DO! thanks for your help... just need my truck to last me.. lol
 
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