Win7 watch web video no sound how to do

Win7 system local player listen to songs and movies have sound but it plays the video of Tudou, Youku, Yo and other websites, as well as RMVB, WMV video in online movies, no sound, webpage The music in the same can't be heard. You can hear the sound by playing videos, music, and FLASH animations on your hard disk. It can be concluded that this has nothing to do with the driver. Reloading the drive did not help. This problem is also very common in Windows XP/Vista. It is not related to Windows 7. It is usually caused by using any optimization software or installing and uninstalling various decoders.

To solve this problem, click “Start"Menu→“Run" Enter “regedit” and press Enter to open the Registry Editor, click on the left pane and click ; HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionDrivers32”, then check in the right pane for the value of "wavemapper". If not, right-click in the blank space on the right pane to create a new string value called “wavemapper”, and then double-click the value to set its “Value Data” as “msacm32.drv”, Restart your computer to resolve the issue.
Tip: If there is no sound after setting according to the above method, please check if there is a volume icon in the system tray. If not, open “sound and audio device properties”, select “put the volume icon into the taskbar", and there will be a sound.