ok, lets try make this a little more understandable.
firstly follow these steps.
1- click the start menu button.
2- type device manager in the search box, click the device manager when it shows in the search result
3- in the device manager window look for the "sound, video and game controllers" section, click the little arrow beside it to expand the tree and see what it says, it will either say realtek or conexant .
once we have established which sound card you have we can move on to the control panel,
open the control panel and change the view to large items, you do this by clicking the dropdown arrow at the top right of the control panel window where it says "view by".
when you can see all the icons you need to look for realtek audio hd manager or words to that effect. or if you have conexant then look for the smartaudio icon
in there will be the settings for your soundcard,
in addition to this you should see your soundcard by right clicking the speaker icon on the systems tray (bottom right of the taskbar)
when you right click the speaker then click playback devices , there will a sound window opens and you will see your soundcard there ,click on it to highlight it and then click set default.
if possible could you do a screenshot of the sound window and post it here for us to get a better understanding.
here is a tutorial how to upload a screenshot to the forum. Screenshots and Files - Upload and Post in Seven Forums