I will scan my computers using SysInternal Autoruns, it have very good ability to check against VirusTotal all files that starts with system.
The emphasis should always be on proactive protection, in other words the virus/malware should be prevented from infiltrating the system. Did you have any of that protection?
So I thinking that 21.02 I was installing a miner, and maybe Phoenix miner or something different I downloaded.
Definitely the wrong step that cost you in the end, of course combined with the fact that your wallet/s was not adequately protected - but even if that was the case, you may have downloaded a keylogger that would deliver your passwords to the attacker sooner or later. My advice to you in the future is to try to have one computer just for crypto and one for fun - it may sound paranoid, but with such a high price that BTC has, every kid is looking for a way to hack some crypto wallet.