See this post for End of Life information for Windows Live OneCare -
http://social.microsoft.com/Forums/en-US/onecaregeneral/thread/81996436-edad-41ba-bdfc-02fc094e2ca9
Note that Morro was a code name for what is now Microsoft Security Essentials.
When your subscription to OneCare expires, download the cleanup tool -
http://social.microsoft.com/forums/en-US/onecareinstallandactivate/thread/399071e2-49dc-4767-932d-d261e3965943/
Remove OneCare via Control Panel, Add or Remove Programs, then run the cleanup tool.
Install MSE from the official MSE download page
See this for a description of what you are losing when switching to MSE:
http://social.microsoft.com/Forums/en-US/onecaregeneral/thread/18015f54-e826-42e1-a69a-2172373c071c
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~