I am on Windows 10 and I am having a similar issue as you. keep getting a appcrash in the event viewer and shows the GW2-64.tmp file. I just submitted a ticket today. I have been having issues here and there, but a reboot would fix it, now nothing will fix it.
If I try to uninstall the game i get the same issue. I even tried to rename the folder and re-install and then got a appcrash on the installer. Very frustrating 😞
May not be the same issue, but the below is the error i see:
Faulting application name: Gw2-64.tmp, version: 1.0.0.1, time stamp: 0x615f3980
Faulting module name: Gw2-64.tmp, version: 1.0.0.1, time stamp: 0x615f3980
Exception code: 0xc0000409
Fault offset: 0x00000000002d829d
Faulting process id: 0x3754
Faulting application start time: 0x01d7bd6c6dedbf77
Faulting application path: D:\Program Files\Games\Guild Wars 2\Gw2-64.tmp
Faulting module path: D:\Program Files\Games\Guild Wars 2\Gw2-64.tmp
Report Id: 24bc91ec-388b-4bad-be2f-db767ea30268
Faulting package full name:
Faulting package-relative application ID: