Add or Remove Programs entry for Sicherheitsupdate für Windows XP (KB917422). This critical security update for Windows XP addresses a vulnerability in the Windows Kernel that could result in remote code execution.

User Profile Elevation of Privilege Vulnerability: There is a privilege elevation vulnerability in the way that Windows 2000 starts applications. This vulnerability could allow a logged on user to take complete control of the system.
Unhandled Exception Vulnerability: There is a remote code execution vulnerability in the way that exception handling is managed on multiple applications that are resident in memory.