I have found that a cumulative update for Windows is consistently failing after installing Immunet. The update succeeded after uninstalling Immunet. There are other updates, like Security and Adobe updates that succeeded even though Immunet was installed, but that specific cumulative update failed. Other anti-virus systems have also been reported to cause the problem. The cumulative update succeeded even though Avast Free Antivirus, Malwarebytes, and Windows Firewall were installed and running.
Problems downloading Cumulative Update for Windows 10 Version 1703 for x64-based Systems (KB4041676) :