Guild Wars 2

how do I repair it? and also since I started redownloading it, it exited out by itself and stopped downloading. wtf

That new build just screwed up my game files. I was in WvW at the time and as soon as it hit my computer just completely froze. so I restarted it and went to open up the game again but it said something about the shortcut having changed or moved. I didnt mess with anything prior to this. I open up the Gw2 folder and all the data is still there, but when I try to install it starts from scratch. please help