Detailed exploit code for a critical Windows worm hole has been published on the Net, putting millions of Windows users at risk of PC takeover attacks!! The code attempts to exploit a known vulnerability in the DHCP Client service. Microsoft warned that a successful exploit would allow remote code execution on Windows 2000 SP4, Windows XP, & Windows 2003 Server. Because of an unchecked buffer, Microsoft said an attacker could remotely hijack a compromised System to install programs, view, change or delete data, or create new accounts with full user rights!! Read more about it here So Windows users get your firewall in place. Use ZoneAlarm Pro. Take a full backup of data, in case the hijacker deletes it!!