Hello r2k2u,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand you are getting the error 0x80070b4 and are having a hard time getting rid of it. I am providing you with a Microsoft Support document: Error message when you run Windows Defender: "Error Code 0x800106ba", which has been designed by Microsoft to address the very issue you are experiencing. Simply follow the instructions and the issue should be resolved.
Please re-post if you require additional support. Thank you for posting on the HP Support Forums. Have a great day!