Microsoft just released critical security patches for Windows, Internet Explorer, Outlook Express, Outlook Web Access, ISA Server, the Step-by-Step Interactive Training engine, and telnet. Be sure to go the Windows Update page for your version of Windows and install the patches needed by your computer if it isn't set to install Microsoft updates automatically.
See: Microsoft Security Bulletin Summary for June, 2005
http://www.microsoft.com/technet/security/bulletin/ms05-jun.mspx
-Bob