DV9999us Sound Hardware stopped working for no reason

This is my first time ever posting to a thread, so if I do a poor job explaining myself, I apologize.
I have an hp dv 9999US laptop which months ago I upgraded to Win7-64 Pro.
I had no problems until a few weeks ago, where all of a sudden one day my sound card stopped responding. The soft touch keys above the keyboard became unresponsive and there was a red "x" next to the speaker icon in the taskbar. If I click on it, I get a "not responding/wait/close" dialogue box. And under Device manager I have no listing for a "Sound, video, and game controllers." Sometimes Device manager shows a device listed as "Co-Processor" with a yellow exclamation after it, but when I try to install a driver for it windows is unable to find one.
Also, when I try and install the driver for my sound card ( when it's not detected in DM) i get a code 10 error that the hardware is not responsive, or something to that effect.
However, sometimes everything works fine. The soft touch keys are responsive, my conexant sound card displays in Device manager, and the volume settings in the taskbar are functional.
I have NO idea what is causing this, but I've tried just about every driver I can find that's compatible with my integrated sound card.
I've done some forum reading, and one thing people suggest is to make sure that the Microsoft UAA bus driver, but I'm a little hesitant to start installing random drivers without knowing what they'll do.
Any advice would be greatly appreciated, and any additional information you need will be almost instantly provided.
Thank you in advance
Mike

Try a smple reset:
Press the sleep/wake button & home button at the same time, keep pressing until you see the Apple logo, then release(ignore the slide to power off).

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