En el foro de Crysis he encontrado:
O.k so here is the fix, grab the Bin64 file here,
http://dl.dropbox.com/u/71527378/Bin64.zipOr here
http://www.mediafire.com/download/iuboq ... /Bin64.zipOk.......here {ENLACE ELIMINADO} WTF Steam these filters are pretty harsh.
Unzip it and paste it into the following directory where you have steam installed Steam\steamapps\common\Crysis
In this folder, do the following.
Rename the Bin32 file to Bin32.bak
Now rename the Bin64 file you downloaded to Bin32
You can now running Crysis in 64-bit.
There should really be a sticky for this in the steam forums. It's disgraceful the amount of people that can't run this game. This fix doesn't seem to work for everyone, but it did for me.
Also if your game is crashing after changing the settings. Turn off your anti-virus software while you try the game, if that stops the crashing, you need to add the game to your AV exceptions. Again not for everyone, but that should work for most folks.
Hope this helps chaps.