Here's an (apparently) odd question for you:
Can you play the Youtube video below?
If not, it means that Adobe Flash Player has ceased working on your computer. (The BBC iPlayer and RadioPlayer also use Adobe Flash Player; that's why I've asked).
If you can't play the video (and probably just see a black box instead), go to 'Programs & Features' from your computer's Control Panel. Locate and remove 'Adobe Flash Player Plug-in'. Restart your computer. Go here to reinstall the Flash Player:
http://get.adobe.com/flashplayer/
Chris