Modern laptops and desktops often lack optical drives.
The game stores all its settings in a file named TRUCK.INI . A corrupted file is a frequent source of errors. Here's how to safely reset it: king of the road insert cd error
The game's configuration files look for a specific optical drive letter (usually D: ). If your modern PC has multiple partitions or lacks a disc drive entirely, the game gets confused. Modern laptops and desktops often lack optical drives