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How do I fix Diablo 3 code 1?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The "Diablo 3 Code 1" error is a common error that can occur when trying to launch the game. This error is usually caused by a corrupt or missing game file, and can be fixed by re-installing the game.

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1. Restart your computer and try again

  1. Click on the 'Start' button and type 'cmd' into the search bar.
  2. When cmd appears in the list of results, right-click on it and select 'Run as Administrator'.
  3. When the cmd window opens, type the following command into it: net stop netstat
  4. Next, type the following command into the cmd window: net start netstat
  5. Finally, type the following command into the cmd window: ping www.google.com
  6. If the computer can reach the www.google.com website, then your internet connection is working and you can try to fix the Diablo 3 code 1 issue by restarting your computer.

2. Update your drivers

  1. Locate the Diablo III installation folder. By default, this is C:\Program Files (x86)\Diablo III.
  2. Locate the "Driver" folder.
  3. Locate the "Diablo III" folder.
  4. Right-click on the "Diablo III" folder and select "update drivers".
  5. On the "Driver Update" window, select the "Windows Update" tab.
  6. On the "Windows Update" tab, select the "Check for updates" button.
  7. On the "Update Driver" window that opens, select the "Browse my computer for drivers" button.
  8. On the "Browse my computer for drivers" window that opens, select the "Let me pick from a list of drivers on my computer" button.
  9. On the "Let me pick from a list of drivers on my computer" window that opens, select the "Browse my computer for driver software" button.
  10. On the "Browse my computer for driver software" window that opens, select the "Let me pick from a list of driver software programs" button.
  11. On the "Let me pick from a list of driver software programs" window that opens, select the "Diablo III" folder.
  12. On the "Diablo III" folder window that opens, select the "BLizzard Entertainment" folder.
  13. On the "BLizzard Entertainment" folder window that opens, select the "Diablo III" file.
  14. On the "Diablo III" file window that opens, select the "game_data" folder.
  15. On the "game_data" folder window that opens, select the "config" folder.
  16. On the "config" folder window that opens, select the "system.config" file.
  17. On the "system.config" file window that opens, locate the "device" section.
  18. Locate the "driver_update" section.
  19. Add a new line to the "driver_update" section and enter the following text: "diablo3"
  20. Click on the "Save" button.
  21. Click on the "Close" button.
  22. Restart your computer.

3. Verify your game files

  1. Launch Diablo III and sign in.
  2. In the Main Menu, click "Diablo III -> Settings -> Account Management -> Verify Game Files."
  3. Follow the on-screen instructions to verify your game files.
  4. If you need to fix any game files, follow the steps in the "Fixing Game Files" section of this guide.

Some users might also have success with the following opitons:

  1. Run the game as an administrator.
  2. Change your graphics settings.
  3. Disable any background applications.
  4. Check for updates from Blizzard.
  5. Try running the game in compatibility mode.
  6. Delete the Battle.net folder.
  7. Reinstall the game.