Win7 Play video don't sound what to do

Local players listen to the music and the movies have sound. But it plays the web site of Tudou, Youku, Yo, and so on, as well as the RMVB, WMV video in the online movie without sound, the music in the Web page can not hear. You can hear sounds when you play video, music, and flash animations on your hard disk. Can be produced to conclude that this has nothing to do with the driver. Reloading the system driver is also useless. If you also encounter such a problem, together to solve:

This problem is also common in Windows Xp/vista, which is not related to Windows 7, and is typically caused by the use of optimized software or by installing and uninstalling various decoders.

To resolve this problem, you can click the Start menu → run enter "regedit" and return to open Registry Editor, and in the left pane click HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionDrivers32 ", and then in the right-hand pane check for" Wavemapper "value. If not, just right-click in the right pane, create a new string value named "Wavemapper," and then double-click the value to set its numeric data to "Msacm32.drv" and restart the computer to fix the problem.

Tip: If you follow the above method set without sound, pay attention to check the system tray has no volume icon. If not, Windows7 opens the sound and audio device properties and selects the "Put volume icon in the taskbar" so that there is a sound.