Microsoft have stopped giving out security updates for Windows 98 and Me (Millenium Edition).
Read more here: http://go.microsoft.com/?linkid=5159436
Also, by 10/10/06, there will be no more updates for Windows XP SP1.
People, that means you will all have to upgrade to Windows 2000 or Windows XP or Server 2003.
However, some computers are not compatible for this upgrade, so you will have to buy a new PC or a Mac.
This sounds like an episode of Doctor Who series 2 here, with all the Cybermen!
More news from the Microsoft Security Newsletter, linked to the Security At Home homepage: