there could be two differrent problems here.
1. Currupted flash player- download flash uninstaller and uninstall your current flash version. then (re)install the current version of flash player.
the flash uninstaller is on this page:
http://kb2.adobe.com/cps/141/tn_14157.html
the current version of flash player is on this page:
http://get.adobe.com/flashplayer/
2. windows mixer in vista/7 has the web browser turned down- Right click on the volume icon in the bottom right hand corner of the screen, and select "volume mixer". then ensure that your web browser (most likely, internet explorer) has the volume turned up.
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