I can’t save my movie

After editing my project, when I click on "save movie" it starts loading but stays at 0% forever, i left my computer for 12 hours and it didn't go above 0%! I also tried to make another video to see if I can save it or not, but I couldn't. I also tried different formats, that didn't work either. It stays at 0% and I have to press cancel, then my computer freezes and I have to close the program!
I don't have problem sharing my movie on Facebook, but I can't save it on my computer.
Anyone can help me? :-/

Thanks