What to do if you can't claim a beta key for a Blizzard game.
Troubleshooting steps for latency problems in Diablo III
Troubleshooting steps for connection problems
Troubleshooting for error 395000.
How to obtain error logs for Blizzard games
Information about troubleshooting problems with the Blizzard Battle.net friends list
Instructions on how and where to download our games
How to install a Blizzard game you already own on a different computer
How to solve this problem on an incomplete Blizzard account
Information on error message BLZBNTBGS8000001C.