I don't like keeping all my eggs in 1 basket!
So I don't trust multi-national conglomerates, who want me to use their stuff at the exclusion of all else.

As a result, I don't use Internet
ExploderExplorer, and I use my own choice of Firewall and Anti-Virus software.
It's not just MS either! I use an Android phone, and don't own an iPod, iPad or anything made by Apple!

Similarly when McAfee (who I used to use) tried to insist that:
1) I uninstall Spyware Doctor, just because it 'wasn't compatible' with McAfee, abd
2) I had to use IE (rather than Firefox or Chrome) if I wanted them to take a look at why the backup facility didn't work.
Then I simply uninstalled McAfee and installed Norton! Problem solved!!