Windows7 playing Flash video has no sound?

There are many users who use Windows 7 Beta and found that it plays FLASH on YouTube, Tudou, Youku and other websites, as well as RMVB and WMV videos in online movies. There is no sound in the webpage. The music on the webpage can't be heard. . Playing the video, music, and FLASH animation on the hard disk is all right and you can hear the sound. Which place to set up Windows7 to solve this problem?

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 ldquo ; 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.