MSI Support > Wind 12 U230,http://www.msi.com/product/nb/U230.html
Driver: Small piece of software that allows the Operating System to communicate with a device
Windblows looses the address to drivers all the time. Suggest you download AND install the proper Realtek audio driver.
Hover your mouse cursor on Download
(Overview / Specification / Download / etc)
In the drop down list click on Driver
Use the blue Down Arrow, and in the drop down list click on Win7 32 (Windows 7 32-bit)
Realtek HD Audio
Release date; 2009/12/09
Click on the blue -> U230_ad_188.8.131.5218_aI00.zip
Click on the country name nearest yours.
A small window will come up on the right -
Make sure the small circle to the left of Save File, has a Green dot in it.
If not click in the empty circle to the left of Save File.
Now go below, and click on OK.
A small download window will come up on the left.
Allow the audio file to download all the way, then DOUBLE-click right on the file.
Follow the easy instructions.
(Next, Next, and Finish)
If not asked to do so restart your computer.