No sound at all

I have just (16/3/16) downloaded Audacity 2.1.2 onto my desktop, which uses Windows XP. I have not touched any settings, merely loaded files to edit. I am getting no sound at all when I play tracks, although sound is working perfectly well on the computer. I can’t see a ‘mute’ button I might have accidentally pressed. Any thoughts?

Use Device Toolbar to choose the correct playback device.