Ok, if it's a Windows system, go to the control panel and click the sound icon. This will open a window that has 4 tabs, Playback, recording, sounds, communications.
On the Playback tab right click the speakers that apply to what you have and choose Configure Speakers. If it is a true 5.1 system you will be able to adjust the levels, etc.
you may need to refer to the laptop mfg support page to get specific instructions/drivers for the device.
Hope this helps.
If this is a Mac, I'm sorry.
