Realtek sound driver uninstall problem

Same prob with ECS 945A - got fixed
Try here:

http://www.realtek.com.tw/downloads/

check your sound card is plugged well in the board or reinstall your sound card driver

'Realtek High Definition Audio' is the name of the device, the driver for it is called something like WDM_235.exe
You should use only one audio device - if there are 2 it will be a conflict. 
First of all go to Start | Control Panel | System and Maintenance | System | Device Manager and see if you have another audio device and, if not, what is exactly the problem - most likely a bad driver install. If it's that then go directly to the Realtek site http://www.realtek.com.tw/DOWNLOADS/downloadsCheck.aspx?Langid=1&PNid=14&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false and download (as in Save, not Run) the latest driver. Once you have it remove all other Realtek driver present, reboot and after closing the New hardware window launch the one you downloaded. 

you must check in your BIOS (when start up press del) and see if your settings whit sound card is ok,you have options to make onbord sound card after removed pci sound card

Ur thinkcenter does not support realtek ac 97 sound driver indeed it supports ADI SoundMAX audio driver which u can download by using following link here is the link

http://www-307.ibm.com/pc/support/site.wss/MIGR-51191.html

uninstall first the previous one from the settings, control panel, add remove programs, then remove realtek driver from it. after removing, install a fresh copy of realtek sound driver that is goes with the soundcard. It should be its own sound driver. be aware of the version of it.

ATI is the graphics card developer. Your motherboard has onboard audio that appears to be Realtek. You should not have an ATI sound driver... as they don't exist.

I'm assuming you're using WinXP to make thing simple. If you're using Vista, try to do the equivalent.

Since your graphics card is capable of HDMI, the problem could be that the card expects to output audio through your graphics card rather than the sound card. Check start -> Control Panel -> Sounds and audio. -> Sounds and Audio Devices /or/ Adjust Speaker Settings -- go to the Audio tab and make sure it says Realtek for output. If it shows more than one output device, set it to realtek. If it doesn't show realtek, follow the below instructions, and then double check at the end that the Output device is set to Realtek.

1>Please go to HP's site and download their Audio drivers.
2>Go to Device manager -> Sound, Video, and game controllers.
2.1> Does it have an entry saying "Realtek blah blah Audio" there? If not, what entries does it have for audio? Ignore Audio Codecs and Legacy Audio Drivers.
2.2>If there's nothing there, you need to install the drivers you downloaded. If there is something there, please continue to #3.
2.3>After installing the driver, restart computer.
2.4>Once computer is restarted, go start -> Control Panel -> Sounds and audio. -> Sounds and Audio Devices /or/ Adjust Speaker Settings. Hit the button labeled Advanced and adjust the speaker setup to whatever you have - surround sound, 5.1, quad, stereo, whatever.
2.5> Go to #5
3> If there is anything that says Realtek/Azalia Audi, right click it and Uninstall.
3.1> Restart computer.
4>Install audio driver you downloaded, and perform #2.4.
5>Find the driver icon (there's probably on in the task tray) or find it under start -> Control Panel -> Sounds and audio. Set your speaker settings there as well. Audio I/O should specify what ports go to what speakers What you set in windows should match the Realtek audio manager's speaker setup.

If problem persists, please report this.

uninstall the ati sound utility, these video cards have a built in high def audio chip for sound thru hdmi

You will want to check a few settings in the control panel of your computer.

1. Click "Start" --> "Control Panel". If your using Windows XP, I recommend you click "Switch to Classic view". Double-click on "Sounds and Audio Devices". First, make sure the volume is not muted. Then click on the "Audio" tab. Make sure there are devices listed, and that they are not grayed out. You may try clicking "Use only default devices". Click apply and test the sound again. If this does not work, uncheck the box and click apply again.

2. The problem may be with your audio drivers. Do a google search for "realtek generic audio driver", or click this link Realtek '97 audio driver.

Download the driver and install it. This will install generic drivers for sound cards, which work with many different brands. Try the sound again and see if this works.

check device manager desription, and error log.. if all normal (i know its sounds stupid) but make sure nothing ismuted, if there is the third parts realtek aidio manager there, make sure that hasnt muted anything.. if everything is normal and still nothing, try un-installing drivers completely in devce manager, restarting system, and re-installing them again..