Sent from my new PC.
I have started transferring files from my old PC to my new one. In case it's relevant to what I'm going to say, earlier I installed Office 365 Home Premium and just before it ended, my new laptop froze, leaving me a BSOD - the PC was switched on but the Power button didn't work.. HP Live Chat told me to hold down the Power Button for up to 10 seconds. That switched off my PC.
When I restarted, I was very relieved to see that Office 365 has successfully installed. But I wanted to know why it had crashed and a Moderator in the Microsoft Community is now helping me with that.
A few hours later and I've just come back to find that although my Vault is showing closed, there's a window showing the list of my log-ins:
No doubt it will sort itself out when I shut down and start up in the morning but just in case . . . .