I am trying to open a Premier Elements file I created a few months ago. I get a dialogue box telling me that I need to activate a MPEG4 SP Component and giving me a code to paste into a webpage. I do that, get the activation code, return to Elements and paste that into the dialogue box and click ok. The dialogue box then disappears and all the clips in the movie are shown as 'offline' and won't play. What's happening? Why is this happening now?