Played the game a few days without crashing. After seeing the launcher downloading an update or something, it now starts to crash like the other guys.
Don’t know whether you guys tried this, for those running Windows 7 64bit, try running GW2 in compatibility mode for Windows XP SP3 (Right click shortcut, look for compatibility tab, you will lose your video, audio settings in game). Seems to be working for me, managed a 2 hour session without any errors. Normally I error out in 15 – 45mins.