Hello. I’d like to help you 2 weeks ago, but my account was bugged and i can’t log in on my GW2 acc on forum… So…
When i reinstalled my system to Win7(64bit) and when I’ve istalled GW2 i had the same problem. So i reinstalled, and it worked 1 time. After reboot of PC i still had same error. So I decided to turn off all of my PC’s programs and just check, what is interupting my GW2.exe. I found bug, with the uTorrent program (I didn’t said anything :p). Anyways, when I want to play GW2 now, I just need to turn off this program. It might be other programs for you, like Steam, Skype or Xfire. Who knows ? Anyways, try to do same things like me, and just good luck ! Call the results and if it won’t be gr8 I will try to help you ! : ). GL & HF