From the article
When computing experts say you should never try out beta-test versions of any system-utility software, they’re almost always right. A bug in a program that lives in the core of a PC’s software could lead to a complete meltdown, not just the usual crashes.
So what’s something called Windows Defender (Beta 2) doing on Microsoft’s home page, atop the “Popular Downloads” list?
Microsoft first released this free anti-spyware tool as “Windows AntiSpyware” in January 2005, a month after it bought the program’s developer, Giant Software Co. After 13 months of development, a few revisions and one name change, this program still isn’t finished– but in that time, Windows Defender has persuaded many users to disregard the rule about beta system utilities.
