I have a HP Pavilion dv7-1444 running Vista 64 bit. I have lost all sound.

I have a HP Pavilion dv7-1444 running Windows Vista 64 bit. I have lost all sound. There's a red x next to the speakeer icon on the bottom right of the screen. I have reloaded drivers, checked Device Manager, tested sounds, HP Support Assistant says I have the latest BIOS installed. I tried a one prong earphone in the two prong headset and got no sound. The mute button and the volume slider don't work either. 
Please help me if you can.

@rerateusa
Go to the link below.Enter your Product Number as listed on Service Tag attached to bottom of notebook (may be under battery). You can also get the Product Number by pressing Fn + Esc key. After entering PN, click Next ,then choose Software & Drivers.On the next page use the dropdown to select your OS (probably Windows 7 64bit). A list will populate with drivers. Download & Save the latest Audio driver.
http://h10025.www1.hp.com/ewfrf/wc/siteHome?cc=us&​lc=en
Go into Control Panel,Programs & Features-uninstall IDT software.Restart the laptop and install using the downloaded file.
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