Backup shows a failure

WHen I run backup the finished result shows a failure, a red X but the Norton Icon on the taskbar shows green.

 

Dell Inspiron, XP SP3 home Norton 360 V 6.1.2.5;

 

I get a message that some files were not backed up and to close all programs and try again.

 

The only program open is Norton running backup which I need to have open to run backup. See the screen shots to follow;

 

norton 5 27 12   1.JPG

norton 5 27 12    2.JPG

 

norton 5 27 12      3.JPG

 

norton 5 27 12    4.JPG

 

 

I know having a failure listed as the first thing in my backup is a bad thing, but I don't know why. How do I solve this?