Why does firefox not appear in realtek sound mixer?

Hi,
I have recently had a virus on my laptop (windows security virus) on a relatively new dell laptop, however I believe I have managed to clear it using spybot and kaspersky. However the sound has disappeared from youtube & bbc etc, all trusted sites. The sound stopped working before I added Kaspersky. I use spotify and the sound works fine on this and so does windows media player therefore it seems only to be a problem with playing sound on the internet. Firefox doesn't appear in my realtek sound mixer and nor does internet explorer. All drivers are up to date, I have uninstalled firefox, I have disabled each plug in individually to see ifthere is a conflict and all sound levels in control panel are set normally (reset to factory default). I'm not sure what else to do; does anyone have any suggestions?
Thanks in advance,
Innes

Do you see the plugin-container process in the sound mixer if you visit a website that plays sound (e.g. YouTube or MySpace) ?
Make sure that the correct sound device is selected.
* https://support.mozilla.com/kb/Video+or+audio+does+not+play
* http://kb.mozillazine.org/Video_or_audio_does_not_play
You can click the Volume icon on the Windows Taskbar near the clock and click the Mixer link at the bottom to open the mixer. 
You can adjust the volume level for each application in that window, so make sure that Firefox is not muted or set at a low level. 
You will only see the Firefox program in the Mixer if you are on a website that plays sound. 
Also check the volume setting for the plugin-container process.

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Why does firefox not appear in realtek sound mixer?

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