Add or Remove Programs entry for Windows XP için Güvenlik Güncelleþtirmesi (KB920683). This critical security update for Windows XP addresses vulnerabilities in DNS Resolution that could allow remote code execution.

Winsock Hostname Vulnerability: There is a remote code execution vulnerability in Winsock that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system. For an attack to be successful the attacker would have to force the user to open a file or visit a website that is specially crafted to call the affected Winsock API.
DNS Client Buffer Overrun Vulnerability: There is a remote code execution vulnerability in the DNS Client service that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system.