Ken, as I mentioned, everything you're describing points to a corruption issue with Windows. In Windows 10, there is luckily a built-in function to deal with these kinds of problems.
First off, don't worry about your e-mails. Those are stored on Hotmail's servers, not on your computer.
Now, if you hold down the Windows key on the keyboard (that's the key with the Windows symbol on it, two keys to the left of the spacebar) and press the I key (that's I as in indigo) then a Settings window should come up.
Once inside of Settings, click on Update and Security and then click on Recovery on the left-hand side. Once inside the recovery panel, you could see one of a few things, but most likely you'll see an option that says "Reset this PC" on the right-hand side. You may also see an option that says, "Refresh this PC."
This should give you a couple of different recovery options, and it will describe each one for you. You will have the option of either keeping your files or removing them (bear in mind that both however will remove any programs you've installed, and those programs will need to be reinstalled).
The reset/refresh which removes your files is a full reinstall of Windows and is more thorough. So if you choose to keep your files and you're still experiencing problems, you can go back and do it again while choosing the option to remove your files. As I said, this is a full install so everything will be replaced by a fresh copy of Windows. This should resolve any corruption problems.
So that is what you'll need to do. It will take some time and you're computer will be offline for a little while while it performs the Reset procedure.
Does all this make sense? Do you have any questions on this?
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