At this point, I would *not* pursue resolving this issue on your daughter's PC.
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
Uninstall OneCare http://social.microsoft.com/Forums/en-US/onecaregeneral/thread/732e6371-2e71-479a-8cd6-b189941ed4fb, use the cleanup tool: http://social.microsoft.com/forums/en-US/onecareinstallandactivate/thread/399071e2-49dc-4767-932d-d261e3965943/, and then download and install the free Microsoft Security essentials for malware protection - http://www.microsoft.com/security_essentials/resources.aspx
-steve