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Uninstall your current driver and download and install one from this site that matches your operating system... http://www.realtek.com.tw/downloads/downloadsCheck.aspx?Langid=1&PNid=24&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#High Definition Audio Codecs
Automatically identify and find drivers
The Intel® Driver Update Utility keeps your system up-to-date. It
detects which driver updates are relevant to your computer, and then
helps you install them quickly and easily.
You must have wrong sound driver download PCwizard and install this program will check motherboard for all your driver and list them sound driver will probably be in differnet section than main drivers note name and number of driver EG cmedia 23415 write down and search for them on the net cmediia 23415 drivers when found download correct drivers for your O/S. to uninstall old driver first go to start/control panel/system/hardware/device manager/ right click on all sound drivers go to properties and uninstall driver reboot you must do this before installing new driver
Are you sure that your two computer are the same specification? if yes then you can copy all the driver from you computer. Do you have Cd utilities enclosed /included in your computer? if yes the insert it in CD/DVD rom and install all necessary driver.(Audio). Is your Audio is built in to your Mboard? if yes then take a look on your board then find the model number of the motherboard. and then search it google like these: Model Number - Download driver or go directly to manufacturer's website in their download driver ans support. ( same you did in add-on audio card).