Losing Ability To Sign in to W10 Account.
By coincidence, I could not log in to my W10 account, this morning, as I got a message saying "Can't log in to your W10 account, Sign out and sign back in.....".
Signing back in didn't help!
It's a coincidence because I last had this loss of sign in just after the W10 updates in the Spring.(Last Night the Autumn update installed automatically)
Anyway, no amount of attempts enabled me to get in except that I could get into a basic account such that I had a little control, even if it was only for a very reduced set of apps.
OK, to get to the point of this post, I cannot stress enough the need to make sure that you always have two accounts which you can log in to.
That way, if one of the accounts gets corrupted, such that you are unable to sign in, as mine has twice, you can get to everything through the other one.
To get the second account you just go in to Control Panel and create a new account, give it a password, and Bob's your Aunty!
You may have to copy some Apps across from the old account - but we can advise how to do that if you wish!
p.s. Having removed last night's updates, I re-updated after I got my system back, today, and nothing untoward happened this time.
Simples!