Error 8921, 229 ??

I am getting an at risk message. when I run auto fix I get after a while of working the message that Norton has encountered an error:8921, 229. I have done a reboot but it still gives that error,

At the same time I get warnings from the Windows cenbter covering antivirus and malware. When I hit the "actualize" button thet Windows asks me whether I trust the application, and I say yes, but nothing changes.

 

Any idea what I did wrong or what I can do to fix this?

 

Thanks a lot in advance!

 

Thomas