Why open a Web page will appear only flash video no sound?

Why open a Web page will appear only flash video no sound?

1WIN7Click the start, Then enter regedit

Win8In the charm bar, type regedit in the search

2 Find this :HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Drivers32, Right-click in the Driver32, click New, click String Value

3In the new string value, enter wavemapper

4Double-click the left mouse button in wavemapper, The value is then modified to msacm32.drv, click OK, And restart your computer