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This is due to the internal speakers which might need replacing, it sounds better with external speakers because they are plugged into the headphone socket which shows the internal speakers are damaged, get them checked out.
Try re-installing the audio driver first. The audio chip maybe faulty.
If you haven't got the driver then download the drivers from the Acer WEB site Make sure you select the model of your laptop and the XP or Vista version of the drivers you that require matches the Windows version that is installed on your laptop. Use this link to get to the Acer support: - http://www.acersupport.com/notebook/index.html
the problem is in the ide controller.go to device manager unistall the primary ide controller restart reinstall it restart again and all should be well also try uninstalling and reinstalling memory controllers,
try finding the equalizer in the sound panel(part of the driver for the built in sound card) . the sliders should all be in a straight line directly across from the "0db" mark. that should solve it. also, disable all the advanced theater effects, they often distort the sound.