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Microsoft wrote:The software giant has warned that three loopholes affecting Windows and Internet Explorer allow an attacker to take control of a personal computer.
http://news.bbc.co.uk/2/hi/technology/4094856.stm
Windows 98, ME, 2000, XP, Server 2003 are all affected by the flaws and Windows users are being urged to download the latest security updates from Microsoft to fix critical flaws.