Norton Ghost 15 Backup Hanges

If I need to abort a Hanged Backup,

 

I find I can if it is under 5%,

 

but if it is over 5% it will not do it, it just sits there for hours, you cannot shut the machine down.

 

What file do I need to cancel in the Task Manager.

 

As in the past I have had to turn the power off

 

Also how do I rest Program