If you've got severe problems with Windows 10 and need to perform more drastic measures to get things working again, you can reset the installation. Your PC will be restored to "as new" condition, with all 3rd party apps removed. You can choose...
Not entirely. But you certainly do seem to have more problems than most users. As Wolfie says, better to reset or, even better, do a complete reinstall!
As the account seems to use Yahoo you may require an app specific password or if available to change a setting to allow (Account) access to less secure apps.
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