Hello I know it's a very old post but I'll try anyway:
either I try to re-install from scratch or use the folder with all game downloaded I cant run the game anymore.
the .exe file is still there and if I move it away and rename the .tmp file and try to run it nothing happens, the launcher does not even show up (but every time I run the original .exe from the website after changing its name to gw2 or gw2-64 the launcher pops up for a second then crashes/closes)
also: I run windows 10, firewall is deactivated at the moment and i dont have an antivirus that can block the game;
also2: I've been playing the past month with no problems after downloading all game files from HoT to SotO after a loooong break.