Then, the box appears. The error that has ended more LAN parties than a power outage:

This is the "Missing CD" error. If you are searching for "Command and Conquer Generals Zero Hour missing CD," you are not alone. Millions of players have hit this wall. But why does this happen, and more importantly, how do you fix it in an era where disc drives are becoming extinct?

You aren't doing anything wrong. The security is doing something wrong. If you are a purist, look away. But for the 99% of players who own the game legally and just want to play, the solution is a No-CD executable (crack) .