Hey, you know your way around a desktop -- so now dig into the Windows operating system and really put its security features to work! Covering Windows XP Professional, Windows XP Home Edition, and Windows 2000 Professional, this supremely organized reference packs hundreds of timesaving solutions, checklists, troubleshooting tips, and workarounds -- all in concise, fast-answers format. Learn the essential tools and techniques for tightening up security on your personal computer or network, including ways to fend off viruses, hackers, spam, denial-of-service attacks, and other threats. Discover how to button up your Virtual Private Networks (VPNs), remote access, and wireless networking services. And take ultimate control of security with advanced solutions such as file encryption, port blocking, Internet Protocol Security, group policies, and tamper-proofing the Registry.