My local Windows account is an account of Administrator type. Note that it's not the built-in account of Administrator name.
Before Windows 10 Pro upgrade, I was using Windows 7 Professional. In Windows 7, I had full Administrator privileges. If I run
cmd, I get an Administrator Command Prompt rightaway. I could freely modify files in any way I want in
C:\Program Files using Windows Explorer windows that I opened normally.
After upgrading to Windows 10, the account is still of Administrator type, but suddenly all the privileges are more restricted. I have to explicitly open things in Administrator mode. If I run
cmd, I get a normal Command Prompt. I have to right-click Start and select Command Prompt (Admin).
As for the system folders, any attempts to modify anything there by myself would simply fail silently. There is not even an alert about a permission issue, asking me to elevate and provide administrative access. Nothing, just completely silent.
I must add that I had the UAC completely disabled in Windows 7, but after the upgrade it was enabled again. So I changed the UAC setting back to "Never notify" (lowest setting), but this doesn't seem to have fixed the issue described here.
How do I get back to having full admin access by default? How did it work so flawlessly in Windows 7, but suddenly break in Windows 10? How can I fix it?