What do you mean by "autoeupdate?" Are you getting a message stating that Windows Automatic Updates is not turned on? Or are you getting a message that OneCare cannot update?
If it is the former, please contact support for help.
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
If it is the latter, please see this post:
Information to help troubleshoot and resolve update problems -
http://social.microsoft.com/forums/en-US/onecareupdate/thread/9a6a0003-b91c-4518-966c-fc50450f0e41/
-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator