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.
What to do if you can't claim a beta key for a Blizzard game.
Troubleshooting steps for connection problems
How to obtain new CD key files in Warcraft III
Information about troubleshooting problems with the Blizzard Battle.net friends list
How to obtain error logs for Blizzard games
Information on what to do when a game update is stuck at 0 B/Ss
Information on moving Blizzard games to a different hard drive
Troubleshooting steps for disconnection issues in Warcraft III.
Follow these steps to troubleshoot problems with your low-speed or wireless internet connection.