I have to wonder why you posted this to the forum that you selected, which is why there has been a terrible delay in responding.
See this post to reset your backup plan if you have changed the backup location. Note that you will need to start a new full backup after the reset (normal for a change of location anyway)
http://social.microsoft.com/Forums/en-US/onecarebackupandrestore/thread/5f18a60d-add4-4ff2-87cf-021db7e81917
-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator