Windows 10: Can someone help me remove this so-called 'antivirus'?

Theres a 'antivirus' called Avast. It keeps preventing me from uninstalling it, ive tried app uninstallers but they've said its a system file. And its also saying theres a password i have to put in JUST to uninstall it, this is bs to me. Can i get some help? This app is pissing me off. After i try to say yes, it pauses my entire screen and there's only a box saying 'insert your password to continue.' And i didn't even add a password.

:)

 

help remove avg antivirus

I am trying to update latest windows update but am told to remove avg antivirus . cant find this anywhere in programs or files. any suggestions

 

Foolproof Idiotproof Antivirus

I'm about to help someone with an internet cafe and i'd like an antivirus that can withstand the most clueless and the most purposeful idiot. Any suggestions?

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code: