IE and Windows vulnerabilities

Secunia - Security and Virus Information:

Internet Explorer Multiple Vulnerabilities
- Extremely critical - 2004-10-12
Multiple vulnerabilities have been reported in Internet Explorer, where the most critical can be exploited by malicious people to compromise a user's system.

Microsoft Windows Multiple Vulnerabilities
- Highly critical - 2004-10-12
Multiple vulnerabilities have been reported in Microsoft Windows, which can be exploited to cause a DoS (Denial of Service), gain escalated privileges, or compromise a vulnerable system."