Comprehensive troubleshooting for any technical issue you encounter that does not have its own support article

Troubleshooting steps for performance problems

Troubleshooting steps for performance-related problems.

Troubleshooting performance problems in Modern Warfare II.

Information about what to do if you are experiencing reduced performance on the Beta version of the Battle.net Desktop App

How to resolve issues with slow patch downloads

Information on error BLZBNTBNA0000012C

Information on error message BLZBNTBGS8000001C.

How to resolve this error in Diablo II

A guide for diagnosing and repairing problems with physical hard drives.