How to repair no audio/sound for vista changed to winXP OS for laptop?

My V3700 Compaq Presario Vista home basic OS laptop is change to Windows XP OS. But now there is no audio / sound being detected. I check the computer device manager for audio but theres no question mark on it. Please help me what to do. ThanksHow to repair no audio/sound for vista changed to winXP OS for laptop?
Make sure your Sound Driver isn't disabled; it may have inadvertently disabled itself during shutdown:

Go to Device Manager (Start%26gt; RightClick My Computer%26gt; Properties%26gt; Hardware Tab%26gt; Device Manager) and right click on your sound driver and choose enable. If not, try updating the driver, which will effectively restore it to factory settings if there's an update available.



If you don't know the name of you Sound Driver, so to Start%26gt; Run%26gt; dxdiag. Now go to the Sound Tab and any sound hardware installed is listed.



If that still doesn't work, the driver may have been uninstalled. If so, go to your computer's manufacturer's website and go to the ';Support'; section. There should be a link for drivers. You will need to know your computer's model, but once you enter that it will give you an option to download any missing drivers. Just find the Sound Driver and install it.



Hope that helps =]How to repair no audio/sound for vista changed to winXP OS for laptop?
download KB888111 fix from microsoft and install it first. then your audio device will be detected.
Install the device driver.
Install audio drivers.