I have a problem with the son of my computer.can i help me????

First of all if you are having the connection problem see that the wire from the speaker or the woofer is connected to output of the cpu( back of the cabinet you will find three jacks you have to plug into the green colored jack) then if it is with the woofer you have to connect the speakers to the output of the woofer, the input of which will be connected to the cpu.
Secondly you have check if the sound driver is installed(start---->control panel---->sounds in your pc if not you to get install the sound drivers for your cpu which you can do it by installing through the motherboard cd that came with the PC or you have to download it from the website www.driverpool.com by choosing your motherboard model