To address the evolving nature of malicious threats, Microsoft’s security efforts are built around complementary technologies that together provide you with layered, in-depth protection. Building on the security advances in Windows XP Service Pack 2, Microsoft Windows Vista has been engineered to be the most secure version of Windows ever. It includes a number of new security features that, in combination, help you accomplish three important goals:

• Enjoy a PC free from malware, including viruses, worms, spyware, and other potentially unwanted software
• Have a safer online experience
• Understand when a PC is vulnerable and how to make it safe again

The security features discussed in this section include:

• Windows Firewall
• Windows Update
• Internet Explorer 7 Protected Mode
• Windows Defender (for protection from spyware and potentially unwanted software)
• User Account Control
• Parental Controls
• Phishing Filter

Windows Defender
Windows Defender lets you make conscious choices about software installed on your PC by providing always-on protection that monitors key system locations, watching for changes that signal the presence of spyware. Superior scanning and removal technologies use up-to-date spyware definitions created by Microsoft, with help from Windows Defender users who submit reports of potential new spyware.

Integration with Microsoft Internet Explorer allows downloaded files to be scanned before they are saved and executed, reducing the chance that spyware might be installed by accident. “Scan on execute” functionality provides an added layer of protection, and integration with Windows Security Center helps you keep track of spyware protection alongside other security and safety features.

By default, Windows Defender scans your computer for spyware every day at 2 a.m. unless you specify a different schedule. During the scan, Windows Defender automatically takes action on High, Medium, and Low Severity items, depending on your preferences.