One of the best way to keep your Windows computer secure has been Personal Software Inspector (PSI) from Flexera (Formerly Secunia). PSI identifies missing security patches on user’s private PC, and automatically installs them when possible.
Unfortunately Flexera has ended support for PSI as of April 20th. I will miss PSI and its functionality. I tried some other apps that claim to do the same thing and they didn’t hold a candle to PSI. My suggestion at least for now is keep Windows patched and use Ninite as an updater.