Apple Acknowledges MacDefender
Trailrunner7 writes with an article in threatpost "Apple is planning to release an update specifically designed to protect users against the MacDefender malware that has been circulating for the last couple of weeks. The update for Mac OS X will automatically find and remove the malware on an infected machine and also will warn users if another infection attempt is detected.
Kudos to Apple for doing what Microsoft has been doing for many years: the monthly updated malicious software removal tool included in Windows Update.
If they still do that. I haven't run Windows in a couple years...
My wife supports a lot of Mac users who literally say stuff like "I don't have to worry about security because I have a Mac." In their minds, they can literally just wash their hands of all security considerations because Apple will do everything for them like a bodyguard from Blackwater. Apple has ridden a wave of anti-Microsoft sentiment in no small part by creating or at least encouraging the impression that if you buy a Mac, you'll never have to think again about taking care of your computer except maybe once a blue moon.
Windows Security Essentials covers both virus and spyware scanning, and is free. And as you said, Microsoft pushes out updates fairly regularly to their malware removal tools.
As long as you're on an up-to-date validly-licensed copy of Windows 7, and you don't do some asshat thing like shut off automatic updates, Win7 is pretty solid out of the box. MSE isn't there by default, but I believe if Windows detects you don't have some other virus scanner installed, it will list it as an important update in Windows Update.
Windows Defender is add-on software because the OS itself doesn't provide enough defense.
No. It is add-on because MS cannot bundle such application for anti-trust concerns. Same with security essentials.
Reading slashdot one-liner: (irm http://rss.slashdot.org/Slashdot/slashdot).rdf.item | fl title,desc*
Apple does not have a setting that automatically downloads files when visiting a website. There is a setting that automatically opens downloaded files, but it's debatable whether they should turn it off or not, since you usually want to open something once you've downloaded it. As others have said before, installing software (any software) on a mac requires your administrator password. You discription can't get much farther from the truth than that You are pretty much completely wrong about everything you've said.