First, let me say, the Dell tech is talking rubbish -you may quote me!
The sound files are wav files.
Try these two options.
1. Open the Control pane - Default programs.
Now select "Select your default programs"
Windows Media player, should be on the list. Click it and click "Set this program as your default"
If it is NOT on the list, then select any media player you can see and do the same.
Now go back one window and select "Associate a select "Associate a file type...etc
Scroll down, almost to the end, and see what you have listed against the .wav. It should now show the Windows media player.