World of Warcraft does not support 32-bit operating systems.

Information on restorations for Diablo III.

How to ignore another player in Diablo II (2000)

Troubleshooting steps for resolving network problems in World of Warcraft. 

Troubleshooting for missing default chat channels like Trade, General or Local Defense.

Gold and items cannot be sent to another realm or faction

This occurs because your game client does not match the version on our servers.

The game cannot log in due to corrupted cache data in the Users/Shared/Blizzard directory, or the directory's permissions are preventing the game from accessing the Users/Shared/Blizzard directory.

How to make a copy of one of your characters in the Public Test Realm and the Beta client

What to do if you want to swap the names between two of your characters.