windows 10

Which free antivirus programs for windows 10 that you would recommend? I have a PC using Windows 10 and needing a free antivirus program for it to protect my PC from virus or malwares.

Hi everyone, I bought a PC from my friend, it is using Windows 10 but when I used it, I saw its name from my friend used before. I tried to change PC name when login or logoff but not succeeded. How can I change PC name in Windows 10?