Thank you for the suggestions. I have tried to repair Powerpoint 2010 even to reinstall the entire software. But it seems like the problem stays unsolved.
I should have made my description clearer. The problem is when I insert audio file to a powerpoint ,the powerpoint turns unable to respond. I have to force close the software.Both powerpoint file and audio file should be OK since my friend can use her powerpoint to edit.
And I don't think there is anything wrong with the software. I guess maybe there is something wrong with the my system set-up.
I have uploaded the problem screen capture video onto youtube. powerpoint goes wrong - YouTube
Take a look please. Thanks.