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Added support for stronger wireless encryption standards, moving beyond the easily compromised WEP.

Improved native support for high-speed USB devices without needing third-party manufacturer drivers. Professional Edition Capabilities a pop-up blocker for Internet Explorer

: SP2 was the major update that introduced the Windows Firewall , a pop-up blocker for Internet Explorer, and memory protection against malicious code. Serious Risks & Drawbacks Microsoft Windows XP SP2 review - CNET a pop-up blocker for Internet Explorer