Cannot View Live Streaming Videos or Games (NASA TV, News Channels, Animal Jam, etc.)

Just about over a week ago, I was able to view CNN News Live or any other news channel. Then everything that streams live would only display black or blank over the given background. I use Firefox. I tried to access live streams via Internet Explorer as well to no avail.

My computer is run on Windows 7 Ultimate SP1 64-bit.  I only use Firefox, except when I to have to compare problems by using IE.

Please advise.