No Audio from built in & external headphone from HP Pavilion dv6810us Notebook PC

I have HP Pavilion dv6810us Entertainment Notebook PC. You can find the complete product details @
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01391847&lc=en&dlc=en&cc=us&product=3686683 .
When I play any video file only picture is visible but no sound is coming from built in speakers. Also audio is not coming although I connect headphone. The speaker icon in the system tray have 'X' (Red cross mark) on it & when I hover mouse on it is displaying message "No Audio Output Device is installed", so I cannot open the volume control.
I don't know how it happened suddenty. Everything was working perfectly fine before. I have not uninstalled any driver. My laptop comes with preconfigured Windows Vista Home Premium SP1 edition & Altec Lansing speakers. Also I can't see "Sound, video and game controllers" in the Device Manager. I tried to "Add legacy hardware" to add "Sound, video and game controllers" in Device Manager, but I couldnt find out the Altec in the manufacturers list.
HP customer care suggested me to install Conexant High-Definition Audio Driver from ftp://ftp.hp.com/pub/softpaq/sp40001-40500/sp40170.exe. But when I try to install it, I am getting error "Driver Installation failed : Could not find the device for this driver."
Can anybody suggest me how can I enable audio without loosing my data on it?

Sanjiv
Go to Sound via Corntrol Panel. In Playback tab you should see Internal Speaker/Headphone with message showing the conexiant working and also a tick in green circle. If not select and apply or OK. This should solve your proble. If not then follow this:
Go to Device Manager via the Control Panel and look under Sound, Video and Game Controller. The active drive like High Definition Audio Driver should be listed. Right mouse click (dont do anything but select Properties and select Driver Tab and see if "Roll Back Driver" is high lighted, if yes then revert back to your previous driver. I think from here on you should be able to manouvers around and get your sound.
Majhud

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It is a terrific place to find answers.
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
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