Windows7 playing Flash video has no sound?

A lot of users use Windows7 beta to find 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, and the music in the webpage can't be heard. . Playing videos, music, and Flash animations on your hard drive 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, generally use any optimization software or install and uninstall each Kind of decoder caused.

To solve this problem, you can click "Start" menu → "Run" to enter "regedit" and press Enter to open the Registry Editor. In the left pane, click "HKEY_LOCAL_MacHINE\\SOFTWARE\\Microsoft\\" Windows NT\\CurrentVersion\\Drivers32", then check for the "wavemapper" value in the right pane. If not, right-click in the blank space on the right pane to create a new string value named "wavemapper", then double-click the value to set its "Value Data" to "msacm32.drv" and restart the computer. Can solve the problem.

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" and check "Put the volume icon into the taskbar" and there will be a sound.