This error occurs when the Battle.net Update Agent can't start due to missing or corrupted data. The Battle.net Update Agent is the program that launches, updates, and installs your Blizzard games.
Restart your computer to resolve problems caused by programs and services running in the background.
Try creating a new administrator account to resolve permissions issues.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
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