Hello, I'm Greg, here to help you with this.
Since you have identified the account as causing this, Test for account corruption by creating a new Local Admin account to see if the problem goes away:
https://pureinfotech.com/create-local-administr...
Sign into the new account, test it works correctly, if so Move your files over via C:\Users. When you choose the old account from the new one there, before it will open your User folders it will issue permissions to you as an Admin for all of them, with a green bar running across the address box of Explorer. This may take a while but you will then be able to open each User folder (Documents, Pictures, Downloads, etc) from Home Tab, choose Select All, then Copy. Browse on left-hand Explorer bar to the corresponding folder in the new account to right click it to Paste, then open and confirm all files copied.
Apps are installed to all Users so they should be no problem.
When ready delete the old account in Settings > Accounts > Family & Other Users, or change it to a Local Account in Settings > Accounts > Your Info > Sign in with a Local Account Instead.
You can change the new account to your Microsoft account if desired in Settings > Accounts > Your Info > Sign in with a Microsoft Account Instead.
Feel free to ask back any questions. If you'll post back detailed results then I may know what to suggest next, if necessary.
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