Icons disappeared

I got up this morning and the first thing is turn the computer on.
Took some time to get on the internet as the computer reported No Internet. However there must have been as I had TV steaming.
As I was restarting the pc, I noticed half my icons are missing too.
Don't see any recent updates. Any ideas?
EDIT: I uninstalled Onedrive some weeks ago, so may be that. Researching.

I thought I had uninstalled onedrive, but on refection I had downgraded to the free version and deleted some files.
I note that when I tried google calendar I had to resign in this am.