how can i install dell optiplex gx270 audio driver
yes install the sound driver
motherboard is dere or not??
You probably did not install a driver for your sound card in Vista.
You can go to the manufacturer's website and look up drivers for your specific computer model. Download and install the audio drivers. If the sound is built-in to the motherboard, the audio driver may be within a chipset/motherboard driver.
download audio driver
The AC97 audio driver is not for sale it is a computer program that allows the audio hardware on the device to function. The driver can be downloaded from the Realtek website.
Some systems still have a dedicated audio card, this is that makes the outputs for sound work. These days most computers don't have specific specific audio cards, most motherboards (even cheap ones) are sophisticated enough to offer Dolby 5.1 via an optical SPDIF socket. So there's no need for an audio card.
what does realtek audio do
A driver is always required to use the sound card. Depending on the age and popularity of the card, Windows 7 may include a driver for the card, so that one does not need to be installed manually.
RealTek Audio Druver
Audio card is the physical hardware that you plug your speakers in to. Audio driver is software, that commands the hardware. You need both to hear sound.
ALSA drivers are built into the kernel. Virtually every that can be used in Linux already has a driver in the kernel. The fact that you are even looking indicates that your sound card is very likely unsupported.