Sound playing is very poor

desktop config:
hp desktop 6000 pro.
cpu:e7500 core2 duo cpu 2.93g
sata hard disk
problems: when i use adobe presenter to listening online course, the nework speed became slow, and sound playing is very bad.
current solution: turn off core2 duo2 cpu functions from BIOS, the problems is solved.
is there someone can explan this issue to me? and give me a better solution without turn off core2 duo2 cpu  functions?
thanks
charles

Hello button172
If you are having an issue with your purchase, then report it to the iTunes Store.
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase
http://support.apple.com/kb/HT1933
Regards,
-Norm G.

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