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1. Contact the manufactuer for the restore CD. it may have a cost but some manufactures will send you the CD free or will allow you to download the driver set from their site. 2. Go to the "device manager" to see if the sound card is working properly. check for updated sound card drivers. (See the helps menu to get to the device manager found usually in the "control panel" 3.Some sound cards are integrated with the mother board and can stop operating. Due to the sound card drivers at times.
if u are very sure your sound card is not faulty, reinstall your os if u can and get your driver from dis address below and instal. "driverscollection.com/?file_id=33146" hope u hear your first sound now.
can u install sound driver of your laptop if u have not install then install form the recovery cd or drvier & utility cd/dvd of your laptop its come with a laptop or if u have miss that cd then u need to download your sound driver
u have came cd with a laptop drvier & utility cd put in cd rom drive it will autorun there was option on sound click on it setup will run
if dont have cd then u can download & install from the by clicking on acer aspire 1640z