I'm no longer able to do any tasks that require administrator permissions, any fixes?

[Windows Server]

I only have one account on my computer and it has administrator privileges, but I'm still unable to do anything that requires those privileges. The only power option I have available is lock and when I do Ctrl + Alt + Delete the only option that comes up is lock again. When I try to use task manager it says "Task Manager has been disabled by your administrator," even though I have never disabled it. Anybody know how I might be able to fix this?

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