Sound schemes system works is not on Windows 8 computer laptop after fully updated from Windows 7

As the title says, I have improved my laptop Win 7 with Windows 8 Pro of Dreamspark (MSDNAA). I also did a clean install of Windows 8 Pro on my PC. Everything goes well on my PC. But on my laptop, the sound system system is cut off, even if the volume of the sound system to 100%. Metro applications notification sounds are silent, too. When I open the sound control panel, al sounds preview worked fine (also good default & custom programs to Windows 7). Also, I check the Windows startup sound 'play' & he play every time I start Windows. All the other audio music, videos, game apps, Internet, YouTube, Flash worked fine, the system of sound patterns are dumb. The audio files are all good, not corrupt, the volume of system sounds even on when I found these files on the array of sounds. But when I actually did things like navigate in File Explorer, connect devices USB, emptying recycled bin, there was simply no sound. I don't know if the problem is with my local Windows 7 account now be upgraded & linked with my Microsoft account, since I've heard of people having the same problem & had to create a new account for. Maybe there's something wrong with the admin permissions that prevent the audio to trigger when the events occur. There is nothing wrong with the audio driver since I've upgraded to the latest Realtek HD 2.70 (support Win 8) on both my laptop & PC, has worked on PC & except for this problem, worked fine with any other audio source on my laptop. Help, please. Thank you!

PS: My laptop is a screen touch 2 - pt 2010, but still usable with the new startup screen. Just info, no doubt, that it has nothing to do with this problem. Although I found it less intuitive than Win 7 desktop. In Windows 7, you can actually swipe to go back & set out in Explorer, touch 2 fingers to right click (rather than just hold), the touchpad had same suggestion of words like WP7. None of them work in the Office of Windows 8. Improve the Office to be more touch optimized, since now the Metro user interface is fully developed. Just say "." Instead, I'm in love, especially on my PC because it run so fast without a hitch!

I think I found the solution. There is a DWORD key "Mute" in my HKCU root key. Delete it & it's back to normal. I don't understand why there is this key exists.

Tags: Windows

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