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.
Troubleshooting steps for disconnection issues when playing Diablo III.
Troubleshooting steps for latency problems in Diablo III
Troubleshooting steps for connection problems
What to do if you can't claim a beta key for a Blizzard game.
These keys require a full version of Diablo III and a game account in the appropriate region.
Troubleshooting steps for performance-related problems.
Information on what to do when a game update is stuck at 0 B/Ss
If you have issues with the sound in your game, such as skipping, popping, screeching, or no sounds at all, follow the steps below to troubleshoot the problem.
Information on moving Blizzard games to a different hard drive