Hello, and thanks for using FixYa.
Sounds like the speakers are not properly connected to the computer, the 3.5mm wire needs to be plugged into the green port on the back of the pc.
Another good idea would be to turn off the microphone incase its causing the computer to make the noise.
Then you need to check that the sound device is working properly and the right device is selected.
You can do that from start -> control panel -> hardware and sound / sounds / sound
You may have more than one option, as shown above, you can test each device by selecting it and then clicking on configure after that you need to find the right one that the speakers are connected to, you can click on configure to perform a sound test. When you hear the test you have found the right device, set it as default, and restart any program that played sound so it now directs the sound to the right output.
if you don't have any device listed then drivers are most likely not installed. and the buzzing is most likely caused by some interference. Some speakers do buzz loudly when the volume is at max.