Im trying to find a movie I use to watch when I was younger. I can only remember brief parts. I think the begining; there was a little boy in an attic. Im sure it was storming. I remember a bright light & loud lightning. There's also a sword, stuck in a stone. Its not animated.

I'm not sure, but take a look at this link to see if it matches what you remember.
http://en.wikipedia.org/wiki/Excalibur_(film)
Good luck!

No, That's not it :/

Check the movies from the following list:
http://en.wikipedia.org/wiki/List_of_films_based_on_Arthurian_legend


The fact that the movie involves a sword in a stone tells us that it is obviously based on Arthurian legend. It's a long list. But the movie you are looking for is bound to be in that list, or at the very least it will narrow down your search online.