Hi Sinala1,
Yes this can be done quite easily.
1.Insert your sound file into your first slide using the INSERT menu.
2.If the Custom animation window doesn't now appear, right click on the small speaker icon which will have now appeared on your slide and select "Custom Animation". Your music file name should now be showing in a window to the right of your screen.
3.Click on the file name and then click on the small drop down arrow which should appear to the right of the file name and select "Effect options....".
4. Now select the "Start playing from the beginning" button and then enter the appropriate number in the "Stop Playing after X slides" selector.
And that should be you - if you remember to turn your speakers on and turn up the Windows volume setting !
Good luck
HM