Sorry to hear it didn't work,
Are you playing through Internet Explorer? or any other browser?
When did the problem start? Are you trying to play Internet video on just youtube, or any other website?
EDIT: I noticed this thread on a Yahoo search:
http://answers.yahoo.com/question/in...6151038AAgnNHr
It basically says:
IE click Tools then Internet Options.
Now click the Advanced tab
scroll down to Multimedia
then check Play sounds in web-pages
Hope this helps
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