Hello there,
Yesterday I noticed that my client was going on a 32 bit version so I checked on launcher and its checked to be launched as 64bit.
So I tryed many ways to start it as 64bit but nothing resolved;
I tried to:
Check entire game
Redownload the launcher
Delete bin32 and bin64 folders and launch the check/repair game mode and made it redownload those folders
Assured that the game is launched as administrator and even checked to be launched as it by checking the box on launcher file property
LIttle edit: I tried to reinstall DirectX (June 2008) too
Game still start as 32bit after these
My system is Windows 7, 64bit ofc. And I played on retail as 64bit for years without any problems
Funny thing: trying some solutions I tried to launch the game by running as administrator the "Activelauncher.exe" that's into the bin64 folder, first try I got back an error, second try it launched but the game was in Polish (I guess)