I have no sound on my computer but everything seems to be on...

my computer is pavilion dm4-2050us
my operating system Windows 7
when i turned on the computer there was what i thought to be an hp update

Get your Product Number by pressing Fn + Esc key or check the Service Tag attached to bottom, may be under battery.
Go to the link below.Enter your Product Number .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.
Go into Control Panel,Programs & Features- Uninstall IDT software.Restart the laptop. After Windows loads, install IDT audio using the downloaded file.
http://h10025.www1.hp.com/ewfrf/wc/siteHome?cc=us&lc=en
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