What to do if you have trouble with the captcha
Troubleshooting steps for performance-related problems.
There's a problem with the connection to the Battle.net servers.
Troubleshooting step for connection-related problems on Windows.
Troubleshooting for installation-related problems on Mac.
Troubleshooting problems with the Battle.net friends list
A guide for diagnosing and repairing problems with physical hard drives.