Scan the computer after each update.
Some time ago I updated a very trusted program, but my cmputer started to act weird.
I disconnected from internet immediately and scanned my computer.
My children told me I was nuts, as I scanned the computer right before the update.
I was right to do so, though.
Turned out someone mimicked the update graphic of the trusted program so well, that I took it for real and downloaded a nasty computer animal.
My scanners caught it and destroyed it. Pffff.