Help! Cannot System Restore, etc

Several sudden issues (after a crash - long story) on which I'd greatly appreciate help please.

Can't do a System Restore
Repeatedly get a message reporting unsuccessful because couldn't access a file, and suggesting I retry after switching off anti-virsu software. Disabled Defender's protection and retried, but same result.

Can't get to 'Settings'
I use the Classic Start Menu. Clicking PC settings no longer works.


Can't get to 'Apps'
The MS Apps are not showing up. Wouldn't normally worry me overmuch but I do need Skype and Camera urgently.




Terry, East Grinstead, UK

Does it work with windows running in a normal configuartion ie, regular windows start menu?

Thanks. Happy to say that after spending most of the morning on this I have now recovered! :)
Those three problems were fixed by doing a safe mode SR. Sets me back a day or so, but worth it.

The initial issue that I was trying to solve (during which I had the serious crash) was relatively trivial. Should post separately but in brief: I installed a new webcam, a Logitech C170. It works in the Camera app and in the Skype app. But after installing Logitech Webcam Software, the Quick Capture in that program does not actiavte the webcam. Much searching reveals it's a fairly common problem, but so far not found a solution.