diagnostic policy Service service has stopped and windows must expectedly shut down

Hello, thanl you for this forum. Much appreciated.
My laptop started with messages that the diagnostic policy
Has stopped and error 5 is denied.
I think i then did something and now the laptop starts and
Automatically shuts down after a min and then restarts.
I originally just wanted to enable this diagnostic pplicy to
Be enabled so that my internet could work.
Do i have a virus?
I am at my wits end.