11 fixes for no sound in Flash videos

Most video websites, such as YouTube, use Flash for their videos. A lot of people have problems with the Adobe Flash browser plugin. The most common problem is that the sound is not working. Below you can find 10 solutions for Flash related sound problems.

1. Flash stores its files in a temporary files folder. A corrupt download can cause the sound problems.
   
   Delete the following folders on XP:
   C:\Documents and Settings\%UserName%\Application Data\Adobe\Flash Player
   C:\Documents and Settings\%UserName%\Application Data\Macromedia\Flash Player
   
   Delete the following folders on Vista/7:
   C:\Users\%UserName%\AppData\Roaming\Adobe\Flash Player
   C:\Users\%UserName%\AppData\Roaming\Macromedia\Flash Player
2. Empty your temporary internet files.
   
   Internet Explorer: Tools -> Internet Options
   Firefox: Tools -> Clear Private Data
   Opera: Tools -> Delete Private Data
3. Empty your temporary files folder.
   
   Use this command to empty your temporary files folder:
   Start -> Run -> RMDIR /S /Q "%TEMP%"
4. Install the latest version of the Flash plugin. You can download it HERE. If you have problems upgrading the plugin, then uninstall your existing version first with this tool. Close your browser(s) before you run the uninstall tool.
5. Run the K-Lite Codec Tweak Tool. Near the top you should see an option to fix the sound (Midi, WaveOut). Select that and press Next. If the option is grayed out, then that particular registry fix is not needed. This fix will restore a missing "wavemapper" registry key.
6. Go to the Flash Player Settings Manager website. Click HERE.
   Check the box called "Allow third-party Flash content to store data on your computer."
7. Go to the Flash Player Settings Manager website. Click HERE.
   Click on the button to remove the data that the Flash plugins has stored for websites that you have visited.
8. Check if your sound device settings are correct:
   Start -> Settings -> Control Panel -> Sound and Audio Devices -> Audio
9. If you have QuickTime installed, then go to the QuickTime control panel. On the Audio tab, set "Default Music Synthesizer" to "General MIDI".
   On the Advanced tab, disable "Enable playback of Adobe Flash tracks".
   On the browser tab, click on "MIME Settings". Under "Miscellaneous", make sure "Flash media" is unchecked.
10. Check if the file msacm32.drv is present in the C:\Windows\system32 folder. If not, copy it from another PC (that has the same version of Windows) and place the file in the system32 folder. If you are using a 64-bit version of Windows, then the file should be present in the C:\Windows\SysWOW64 folder.
11. If you are also having sound problems with other applications, then re-installing your audio drivers might solve the problem.