Cannot insert audio files unless speakers/headphones are present. HELP!

[brennj4]

I have windows 7 machines with no speakers plugged in. This is common in our computer labs. When users attempt to insert audio into a powerpoint presentation (powerpoint 2010) they get an error message: "Powerpoint cannot perform this operation because the audio device is unavailable. Check to see if the speakers are plugged in and the audio device is working and then try again." Any ideas how I can get around this without needing headphones/speakers installed on each machine?.




Thanks in advance