Input/output sound for MacBook Pro 10.6.8

The sound is not working properly for my narrated powerpoint presentation. I have recorded it on my MacBook Pro 10.6.8 and I get some sound but it sounds like feedback or something (like a scary phantom voice). I am using the internal microphone and internal speakers. I have checked the sound volume and speech recognition and have calibrated this. I am using powerpoint for Mac 2011 v. 14.4.1. What's happening?
Hoping someone can help, I desperately need it to work!
Thanks in advance.

If your computer shipped with Mac OS X 10.6.8 or earlier, it'll have come with a DVD. If needed, phone Apple and order a replacement.
Unless you got Mac OS X Server with it, which is highly unlikely for a portable computer, that DVD will contain iLife.
(115500)

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