For a while now, I haven't been able to view YouTube clips at all

I get the following error message:
Quote:
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Hello, you either have JavaScript turned off or an old version of Adobe's Flash Player.
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I've downloaded the latest version of FlashPlayer & I've definitely got JavaScript enabled but I still keep getting the same error message.
I use FF browser but I've also tried in IE & I get the same message.
Any ideas on what the problem might be & how to fix it?