Potential Fix
I was experiencing crashing to the point where I couldn’t even run -repair due to corrupted files. I found out that one of my sticks of RAM was failing using Memtest and promptly removed it.
I then read this post and surprisingly the fix worked 100%. No repairing, no reinstall. Here’s all it took:
Right click the GW2.exe > Properies > Compatibility > Select to run this program in compatibility mode for Windows XP (Service Pack 3)