Failed to launch Agent or AgentSwitcher. Please close all other applications, temporarily deactivate your anti-virus software, and try again. Alternatively, log in as an administrator and try again.
Error: BLZBNTAGT00000871

The Desktop Application can't launch Agent or AgentSwitcher, which are required to install, update, and run Blizzard games. Permission conflicts or file corruption can cause this error to display.

  1. You may experience errors when Update Agent files are missing or corrupt. Delete the Tools folder to have the Update Agent recreate necessary files.
  2. requires administrator privileges to install, update, and run Blizzard games properly. Be sure to run the application in Administrator Mode.
  3. Programs running in the background can conflict with Try closing background applications.
Advanced Troubleshooting
  1. Try creating a new administrator account to address permissions issues and try again.
  2. Security software can interfere with and prevent it from running properly. Disable or temporarily uninstall any security programs.

Tried everything here?

If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) (Heroes of the Storm) or contact us.