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When i play a video on youtube or facebook there is no sound but there is video, i dont know whats the problem i tried everything in the suggestions but nthing worked .. please i need help

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I always used internet explorer but after i downloaded windows vista service pack 2 i had a problem with the sound while playing any video , there is no sound but there is video so i switched to firefox and the same problem occurs.

This happened

Every time Firefox opened

== today

I always used internet explorer but after i downloaded windows vista service pack 2 i had a problem with the sound while playing any video , there is no sound but there is video so i switched to firefox and the same problem occurs. == This happened == Every time Firefox opened == today

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there is no sound helpe pls.

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no sound while video O.K

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Video works, but no sound. Sound works in media players, chrome, etc.