When i format my computer realtek sound device is unintall so i want to install realtek sound device

if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager scroll to sound,video and game controllers you might see a yellow question mark? Right click to reinstall drivers if you dont have a motherboard disc you will have to download the drivers

http://download.cnet.com/Realtek-AC-97-Driver-Windows-Vista-Windows-7/3000-2120_4-10962344.html
Realtek AC'97 audio driver package. The package includes: driver setup program, drivers for Vista/Windows 7 32-bit and 64-bit editions.
hope this helps

http://download.cnet.com/Realtek-AC-97-Driver-Windows-Vista-Windows-7/3000-2120_4-10962344.html
Update your embedded sound from Realtek to the latest AC'97 codec.
if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager scroll to sound,video and game controllers you might see a yellow question mark? Right click to reinstall drivers or you can download the drivers

Download the driver software by

http://download.cnet.com/Realtek-High-Definition-Audio-Codec-Windows-Vista-Windows-7-32-bit/3000-2120_4-10788600.html free sound drivers

http://download.cnet.com/Realtek-AC-97-Driver-Windows-98-Me-2000-XP-2003/3000-2120_4-10238712.html
Realtek AC

I think you need to install 'RealTek Driver' for your operating system. Download that from internet for your operating system.

If you are using XP go to control panel and left click on sounds and devices icon.Check that mute is not selected and also check that realtek id default sound device.You could also try uninstalling sound card drivers and re-installing them in the Device Manager section. If you have onboard sound you may need to use a seperate pci soundcard which should come with drivers on cd but make sure you disable the onboard card first. Hope this helps.

Please make sure that the support driver for that sound device that you have are all setup or installed. Get your motherboard's software CD and run the installer for sound drivers.

This document pertains to HP or Compaq PCs with an HDMI (High-Definition Multimedia Interface) connector for connecting a monitor or TV. If you use HDMI to connect your display, you must activate HDMI sound by adjusting your Windows settings . If HDMI is not activated, you cannot hear any sound. Because of this, HP recommends that you connect analog speakers to the computer to hear sound during the initial setup of the computer. Use the following steps to activate HDMI sound on your computer: NOTE: If you ever perform an HP system recovery, you must repeat this procedure to activate sound for the HDMI connector.

1. Right-click the Volume icon by the time in the lower-right corner.
2. Click Playback Devices . The Sound window opens.
3. On the Playback tab, click Digital Output Device (HDMI) if it is listed. If it is not listed, click Realtek HDMI Output . Figure 1: Digital Output Device (HDMI) selection Figure 2: Realtek HDMI Output selection
4. Click Set Default .
5. Click Apply .
   • If you used Digital Output Device (HDMI) , click OK to close the window. This completes the steps to activate HDMI sound.
   • If you used Realtek HDMI Output , continue with Step 6.
6. Double-click Realtek HDMI Output . The Realtek Digital Output Properties window opens.
7. Click the Supported Formats tab.
8. Place a check in the 48.0 KHz check box, and make sure that there are no checks in the Dolby Digital check box and all other check boxes. Figure 3: Supported Formats settings in the Realtek Digital Output Properties window NOTE: For most TVs to play back audio, the sample rate must be 48.0 KHz.
9. Click OK to close the window.

Where is a beter place to download drivers for your MB other than this?
http://www.gigabyte.com.tw/Support/Motherboard/Driver_Model.aspx?ProductID=2755&ost=xp#anchor_os

Select your OS from the dropdown list in the middle of the page.
Seems like you have a Realtek Azalia audio chip.

http://www.new-drivers.com/files/sound/Realtek?gs.realtekgeneral&gclid=CN37x6mp1ZoCFRUhnAod3Fz22g

need to download your audio card driver

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There is no sound after installing realtek audio driver. What to do next?

You can goto device manager by right clicking the My Computer icon then select properties command. In the pop up windows select the Hardware tab, there you will find this Device Manager. Right click the sound devices entry and select update driver. When prompted select "Go to web". You will get the required software automatically and your system will sound again to give you the mental peace.