If the chinese didn't keep coming back, I wouldn't mention AV again
😉
But.. I would dl https://antivirus.comodo.com/antivirus-for-windows-10/ or
http://www.bitdefender.com.au/solutions/free.html and get a second opinion. Defender better than nothing but there are also better choices.
Maybe NZ got invaded and they weren't going to announce it until midnight but they messed up your time zone. Australia will have to rescue you... if we not busy tomorrow. Actually, with the amount we trade with them, and their size, you would likely be on your own. We would likely be next.