This error can happen when permissions are not allowing the Battle.net application to install updates for games. Follow the steps below to resolve the issue.
Run a security scan to remove any viruses or malware infections.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
Update your drivers and operating system to resolve any compatibility issues.
Close all other applications to resolve software conflicts and free up resources.
Try creating a new administrator account to resolve permissions issues.
Tried everything here?
If the steps above did not resolve your problem, visit our Technical Support forum or contact us.