There are certain cases where new user accounts may be created automatically in Insightful:
When changing a password on Windows (Windows creates a temporary account when the password is being reset, and it deletes it immediately after)
When antivirus software performs system operations
When a new person logs onto a company computer with Insightful already installed on it
When an existing employee logs onto a company computer using a different Windows username (e.g. a shared account or personal profile), Insightful registers it as a separate employee.
This is expected behavior and part of normal system functionality, but please keep these cases in mind and check your employee page regularly, so that you can deactivate any employees you don't want to track and be billed for.