Whenever you download new software or updates the provider of that software normally reconfigures various settings in your computer, such as what programs are employed to view video & images, or play music. Something as innocent as clicking on a pop up window "ad" can trigger the loading of software & reconfigure your settings. I have a suspicion that something like this happened about a week ago. One type of software that can be very invasive & reconfigure things is your anti-virus, anti-spam & anti-spyware software. If that was recently updated that could be the reason the error messages started showing up a week ago.
Russ my computer has both Firefox 3.0 & IE 7, both of them play the music & video just fine.
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