right click on the "my computer" icon on ur desktop and select "properties". In the new window that opens up, click on "hardware" tab and then click on "device manager". In the list shown, see what is shown next to "Sound, Video and game controllers". Does it have yellow icon on it?
Also, no offenses, but can you please also tell how familiar you are with all this stuff? Basically just want to know your level of knowledge or amateurity about computers so I can help accordingly. For someone completely amateur, the steps above are good but for someone who knows about it, I could have skipped a lot of the basic steps.