This is usually the "Creative ALchemy" problem. Open your Documents\NFS Most Wanted\ folder and delete player.config . The game will rebuild it. Then, set the audio in-game to "Stereo" (NOT Surround or 5.1).
folder. Running this as an administrator can help register the video files for the game. Performance Note If you still experience audio lag after the fix, try limiting your framerate to 60 FPS
For years, this made the game literally unplayable without fan intervention. This is where the "Fix" comes in.