Obtain the authentic English.pak and associated audio files from a verified source or another clean installation of the game.
If your installation already contains the files but lacks the configuration setup, you can verify your game cache on Steam or GOG to automatically fetch missing files. If you are downloading a standalone language pack pack from a trusted community forum, ensure you receive the following essential archive files: Crysis 1 English Language Pack Download
Go to your local Crysis installation folder. The default path is: C:\Program Files (x86)\Steam\steamapps\common\Crysis\Game\Localized Inside this Localized folder, you should see one or more language files, such as German.lng , Russian.lng , Polish.lng , or, hopefully, English.lng . If you see the English file, simply rename it to Default.lng . If you see your current language file (e.g., German.lng ), rename that file to Default.lng instead. This forces the game to load the correct language at startup. Obtain the authentic English
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Electronic Arts\Electronic Arts\Crysis . Find the string and ensure it is set to English . This forces the game to load the correct language at startup