Corrupted and damaged game files can create a wide variety of problems and errors.
Out-of-date drivers and operating systems can cause a variety of issues, and are one of the first things to check when a game is having problems.
Information about this error when redeeming a key in your account
Troubleshooting steps for disconnection issues when playing Diablo III.
Troubleshooting step for connection-related problems on Windows.
Information about the global play feature of Blizzard games.
Follow these steps to troubleshoot problems with your low-speed or wireless internet connection.
How to view and send the game key for a gift
How to resolve this issue when installing or updating a game
Troubleshooting steps for performance-related problems.