I recently installed the most recent XP update related to Microsoft Security Bulletin MS03-027 (821557). After installing the update, the installation required a reboot. After rebooting, I cannot access web pages. I uninstalled the update and my browsers (IE and Opera) worked fine. I reinstalled the update, rebooted and was able to browse using Opera. I then opened Internet Explorer and pages cannot load. The status bar reads "Web Site Found. Waiting for reply." and the status bar shows the page has is 50% loaded and then stalls. I tried to use Opera again and it cannot load pages either. Rebooting does not solve the issue. 3 questions: 1) Has anyone heard of this happening? 2) How risky is not applying the update (I am behind a firewall)? 3) What exactly does this update do? Any help would be greatly appreciated!