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I would open Device Manager and delete the current device and then restart the PC. When it starts and detects the new hardware, cancel the installation. Run the setup file that was downloaded. When the installation has completed, restart the PC again and test the sound.
BrendanG21, I had the same problem this morning. My sound actually quit in the middle of listening to music. Simply restart your computer (it may take a couple tries). If it's saying you have no audio device installed, but everything looks normal when you go into device manager, it's probably the same problem and this should work.
Running Windows XP Dell B130 laptop Sound devices listed under my device manager: Audio Codecs Legacy Audio Drivers Legacy Video Capture Devices Media Control Devices SigmaTel High Definition Audio CODEC Video Codecs
try this steps When
installing Sigmatel* or Realtek* audio drivers (either from the Express
Installer CD or using the latest driver download available from the web), the
installation may fail with either of the following error messages: ·Device Object not present, restart
the system and run setup again. ·The system does not support the
driver you are attempting to install. The Universal Audio Architecture (UAA) High
Definition Audio class driver for Windows* may be corrupted or causing problems
with the audio driver installation.
To resolve this, try the following: 1.Click Start > Control Panel > Add/Remove Programs. 2.Look for the following two items: Realtek* High Definition
Audio Driver and High Definition Audio driver Package - KB888111. 3.If these items are listed in Add/Remove programs, remove them.
4.Restart Windows. 5.Download the latest audio driver for your desktop board
from DownloadCenter. 6.Double-click the filename to extract the files. 7.Go to the folder where the files have been extracted and browse
to the \HDAQFE\xpsp2\us\ folder or the \MSHDQFE\Win2K_XP\us\ folder.
(The name of this folder depends on your desktop board model.) 8.Double-click the file kb888111xpsp2.exe to install
the High Definition Audio Driver Package. 9.Restart Windows. 10.Install the audio driver.