I had this from IT safe (Part of the UK Government) which alerts you to security loop holes made by Microsoft
What is it?
A problem affecting Internet Explorer 5.01 on Windows 2000 systems.
What does it affect?
This could enable an attacker to gain control of computers that use this
How do I fix it?
Update your copy of Internet Explorer with the download available from
Details of Specific Problem
This problem with Internet Explorer is described in more depth by the
The supplier's page also contains the URL to download the fix: please see
our URL security guide for advice on following links
Details of Underlying Problem(s)
The technical issues are described at the CVE website, as CVE-2006-0020