My satellite L675D-S7015 all of a sudden, no sound from HDMI

I have a satellite L675D-S7015.  It came with HDMI out, blu-ray player and all the bells and whistles. Up till a week ago the only thing I had to do to it was replace the screen after my friends kid broke it. But last week, I lost all sound to my receive. Now I have checked everything I can...made sure it was set to default....in the sound icon and by going through the realtek HD audio mgr. Made sure nothing was muted and all that good stuff. I then went into my device mgr...only to see that my ati HD HDMI driver had been replaced by some generic HDMI sound driver. I've uninstalled this several times and reinstalled the Realtek driver...only to have it replaced again.  Is there a way to stop this?  or what do i need to do to fix it?  the generic HMDI driver will play sound, but I have no control over its settings it seems.  And also...I thought that HDMI was more than just stereo?  but the realtek HDMI settings, even when I have the box checked for it to allow true dolby d and dts, it doesnt give me any other optin in setup other than a stereo one?  am I missing something?

I found this on the Microsoft websiite. (I am assuming you are running a Windows 7 machine)
Windows 7 auto update overwriting Realtek audio drivers on startup in Windows 7
And here is another thread in our forums stating the same issue.
Realtek Sound Drivers keep getting replaced by generic sound drives causing no sound
Here are a couple TOSHIBA KB articles for troubleshooting No Sound issues:
No sound from speakers or headphones
Windows Vista / 7 - Troubleshoot no sound with Windows Audio Troubleshooter

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