Norton Ghost 14.0 .... need help cleaning up old backups

I recently restored my PC using a recovery point created on 1/1/2009 and an incremental backup created on 1/23.

 

I took a new recovery point today 2/1/2009.

 

I am using Norton Ghost 14.0

 

Now I want to clean up some old backups.  When I go to look at my list of backups it only shows today but there are 10 going back to March 2008.  Yet when I look at my file backups they are all there.

 

How can I delete those backups from my C drive that the PC does not see?