OOOOkay dokey, no probs wynette, first do you even have speakers (oh do say yes I assume you do) and is there a button on them for volume, if so, turn it up. 2> now, on the bottom of your screen you might find a little teeny speaker, if there is one there you can a) left click on it and that should bring up a sliderbar to raise and lower the sound, or

right click it and that should give you your main sound panel where you should have an equalizer sort of mixing board sort of like a stereo, from there you can adjust the volume as well as amount of bass/mid/treble. If there is no speaker icon there on the bottom of your screen you will have to go to (don't know if this is exactly the same for XP) My Computer (double L click usually to open), you will see Control Panel (double L click to open) and in the window that opens you should be able to find a little bity speaker icon, or maybe in some cases something that says 'sound', revert to suggestion 'a' and go from there.
Good luck in figuring it out, if ya gets stuck just let us know in the appropriate forum (in this case it'd be hardware) and someone is bound to come up with an answer or two for you. Cheers

quick edit>if you have a cd in your PC or laptop, which I'm sure you do, try putting in a music CD and playing from there to test your sound. When you do this it should automatically bring up whatever media player you have installed and then you just treat it like a stereo (push > for play etc).