Invalid Halo Combat Evolved CD key? Don’t worry, you’re not alone. This is a common issue that a lot of people have been experiencing. Luckily, there is a fix.

The first thing you’ll need to do is to uninstall Halo Combat Evolved from your computer. Once it’s uninstalled, download and install the latest version of Halo Combat Evolved from the Xbox website.

Once the game is installed, open it and then sign in with your Xbox account. Once you’re signed in, the game will automatically download any updates that are available.

Once the updates are downloaded, you should be able …