Add or Remove Programs entry for Windows Millennium Edition KB891711 Update. This is a critical security update for Windows Millennium Edition that addresses a vulnerability in Cursor and Icon Format Handling that could lead to remote code execution.

Cursor and Icon Format Handling Vulnerability: A remote code execution vulnerability exists in the way that cursor, animated cursor, and icon formats are handled. An attacker could try to exploit the vulnerability by constructing a malicious cursor or icon file that could potentially allow remote code execution if a user visited a malicious Web site or viewed a malicious e-mail message. An attacker who successfully exploited this vulnerability could take complete control of an affected system.
Windows Kernel Vulnerability: A denial of service vulnerability exists in the way that cursor, animated cursor, and icon formats are handled. An attacker could try to exploit the vulnerability by constructing a malicious cursor or icon file that could potentially cause the operating system to become unresponsive. The operating system would have to be restarted to restore functionality.