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.
How to obtain new CD key files in Warcraft III
Troubleshooting steps for disconnection issues in Warcraft III.
Troubleshooting steps for performance-related problems.
Information about error BLZBNTKEY00002034.
Information about this error when login to Classic Warcraft III
Information about error BLZBNTKEY00002037.
Follow these steps to troubleshoot problems with your low-speed or wireless internet connection.
How to obtain error logs for Blizzard games
Information about troubleshooting problems with the Blizzard Battle.net friends list