100% and stops exporting resulting in a corrupt file

Hi, I am very frustrated at the moment as I spend alot a month on adobe for students and this has been wasting alot of my time as a student, I try and export a video and it gets too 100% and that's it, it just freezes and I wait ages and nothing I hit cancel because nothing has happened for over 2 hours, I have tried multiple times to re export etc and the same problem. This is stupid now as I have wasted hours od potential study, so thanks for that adobe. I don't know what to do as anything just fails and it's ridiculous I NEED this video for my grades and adobe software is doing nothing but screwing me over with constant failed exports. If anyone can help please let me know and my grades is on the line if I can't get this exported,

thanks 

and fix your stuff adobe, multi millionaire company and there's constant crashes nice one.