system
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you log in as admin, not as user. I’m guessing here, but with your machine running normally you don’t have any prompts stopping you installing or running any programmes. Example, you find a file you want to download, you can do that without any problem. You have “global” rights on your system, if windows popped up a box and you had to “run as” and type your admin password that would be the best setting.
For maximum security, any accounts used can’t install and run any files. you have to log out and log back in as sys admin (with a diferent profile and password) to install the file on a per user basis or “globally” all users.