Sound Device

Hello,
Ok, so i tried to listen to music on my computer that operates on a windowsxp, and I get a message that "No audio device". Honestly, I don't know what a sound card is, I've got a couple of computer speakers but when I plug it in the PC, they are not read. Aside the music, I decided to make a movie project and when I clicked on the "movie maker" icon, I had a message that said "sound device not found on your computer". What should I do, please help me