How to redeem a code for a game, a product, or Blizzard Balance.
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 latency problems in Diablo III
Troubleshooting steps for connection problems
Troubleshooting steps for disconnection issues when playing Diablo III.
Troubleshooting step for connection-related problems on Windows.
Information on moving Blizzard games to a different hard drive
How to install a Blizzard game you already own on a different computer
How to obtain error logs for Blizzard games
Troubleshooting steps for performance-related problems.