I have an hp dv2940se. I installed windows 7 but I have no sound. There's the red "x" on the volume

In the device manager, the only compatible sound driver is Bluetooth Hands-Free Audio which is not working. When I select any other, there's the message "found driver but encountered an error installing"
I switched back to vista but the problem persists. When I try to download drivers from the HP website I get the message "drive installation failed. Cannot find media device for this driver "
SOMEONE PLEASE HELP!!

* https://support.mozilla.org/en-US/kb/Installing%20Firefox
* http://kb.mozillazine.org/Installing_Firefox

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