Hdmi sound problems with m9150f in media center

I am running a pavilion m9150f Q6600 vista 32 bit and GeForce 8500 gt graphics on a sony wega 55" lcd projection tv. Recently I have been having problems with media center sound. Recorded programs from standard channels (2-64) seem fine but hd channels (1341, for example) produce an error message stating "Unsupported Audio Signal. Please check device output." Which kills all sound from Pc. After shuffling through various output options, often returning to the original settings, and occasionally reinstalling devices or drivers, the problem is fixed. Then, seemingly at random, POOF!, error occurs again.I am at my wits end and am ready to throw my PC out in the street and hit it with a bus! Please help prevent its untimely demise.
 Thank you.

Hi again
I have downloaded the Realtek sound driver from the Tosh page and unzipped it.
(I have chosen the driver for Vista!!! I suppose you use Vista???)
There is a folder called sound. Access this folder and run Setup.exe
But before you will start this procedure you could access the device manager (control panel -> computer -> device manager) and choose sound, video, and game controller. There you have to mark realtek AC and click on uninstall and reboot the unit.
After this sound driver removing you should start the new driver installation described above. (setup.exe)

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