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I would believe that your sound driver is not supported, if this is a new issue and it worked before maybe your sound card has become unseated if it is not integrated. If it is a new card try installing the newest drivers from the manufacturers web site.
If your sound-card is "integrated" on your motherboard, then access the web-site for the manufacturer of the motherboard, and download the "audio" device-driver for XP/Vista/7, and install the driver.
If your sound-card is a PCI add-in card, then access the web-site for the manufacturer of the sound-card, and download the "audio" device-driver for XP/Vista/7, and install the driver, e.g., 'www.SoundBlaster.com' for the Creative Labs "Sound Blaster" series of sound-cards.
Without more information on the specifics of your sound-card, I cannot be more specific.
1. You will need to find out what sound card you have most likely its realtech on acer, then go to web site for sound card and download windows 7 driver if they dont have one yet which is very possible then try the one for vista it works about half the time.
generally when you install any drivers , after installing successfully the system will restart. i think you are not installing your correct sound drivers. Install your sound card drivers from the motherboard CD. If you lost your motherboard CD , then go to this website www.drivermax.com . Install the software,it will automatically detect your hardware devices and installs the correct drivers .
I have done some searching on the creative site and online and I believe you just need to download the SoundBlaster Live! driver pack from the Creative Site. You, alternatively, can register and browse soundcard-drivers.com to try and find a compatible driver.