Windows Security patch required

This concerns Windows PCs (XP, 2000, NT) which are NOT centrally managed at CERN for security patches, e.g. home PCs, experiment PCs, portables,...
A security hole which can give full privileges on Windows systems needs to be URGENTLY patched. Details of the security hole and hotfix are at:

http://cern.ch/it-div/news/hotfix-MS03-026.asp
http://www.microsoft.com/technet/security/bulletin/MS03-026.asp