Follow the instructions in this post, http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=662566&SiteID=2, to report a virus that is not cleaned by OneCare and to get help in removal.
If you are in North America, you can call 866-727-2338 for help with virus and spyware infections. See http://www.microsoft.com/protect/support/default.mspx for details. For international information, see your local subsidiary Support site.