MSFS - a hard disk killer? Or is it a virus?

I would not recommend running both the windows firewall and a separate firewall together, although I know some folks who do.

Very good point TeaSea, I meant to mention that, running 2 software Firewalls can cause all kinds of problems, you really have to work on the configurations of both and that is a PITA. You can do fine with a Router Firewall and an additional software firewall if you are seriously worried, but for most users that is not really necessary.
 
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