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.
Information about this error when trying to log in
Troubleshooting steps for this error in Diablo III
A community site or app throws a 404 error when attempting to login via B.net or when accessing your Battle.net data.
What to do when the Battle.net Desktop App won't let you stay logged in
Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website
How to resolve this error when trying to log in to Battle.net
Using LogGoblin to gather Battle.net Desktop App logs.
What to do if you get a "Something went wrong" error when logging in to the Battle.net Mobile App