I've spent hours trying to figure out why I can't run things as the administrator, which I've done since I bought the Dell XPS8730 (none one else uses it). I can't even run Windows Defender or make any changes. Only Malwarebytes Premium works.
This is Win10 Pro. I don't understand the difference between local account and Microsoft account. I think it's the latter. I found a way, after spending 10 hours Googling, to disenable the god-awful UAC that kept popping up all the time. There's only one person who has access to my XPS8930, and that's me! I don't know how to get rid of the idiotic administrator/other user division. No one needs any privileges. There's only ONE user, one administrator. Period. Windows is making me want to throw up.
You are the only human user, there should be several other users on the PC that windows uses to carry out operations for you. These include System & TrustedInstaller, among a few. Its not a good idea to remove their access as windows won't work well.
Local user accounts are only created on that PC, they aren't always admin accounts unless made one after creation.
if its an MSA, its possible your current user profile is corrupt,
there is a simple solution, make a local user account and use it.
make a new local account and make it admin - https://support.microsoft.com/en-us/windows/create-a-local-user-or-administrator-account-in-windows-10-20de74e0-ac7f-3502-a866-32915af2a34d
while logged into user that has problems, go to C:?users folder
copy the contents of the old users folder onto the new user, giving it full access to all files on PC now.
logon to new user, do you still have problems?
if it fixes problem, its easy enough to switch to new user and you can even link it to the same email address as 1st user if you wish. You shouldn't need to reinstall anything.