Talked to my wife. She tried to install a voice changer software yesterday from a link on twitter and it didn't install. This is a windows 11 PC. I see something new called WingFtpServer as a startup program. That has to be it. C'est la vie 
Yep you got it.
You made lots of mistakes. You kept your coins on a windows pc which you used it to download shady programs… means it is also connected to the internet and you are not a newbie too.
It is like You wanted to get hacked and you accomplished it.
Money business is serious business which takes serious responsibility. R.i.p 11 btc…
Now you know what to do and what not to… next time