Try checking your hard drive for errors, then run tuneup. How to check your hard drive for errors -
http://support.microsoft.com/default.aspx/kb/315265If deffrag does not run after checking your hard drive for errors please contact support. How to reach support -
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
Jim - MVP Windows Live - Forum Moderator - Live One Care - Live Mesh