How do I delete old Norton Ghost Backups?

My laptop came with a trial version of Norton Ghost (2006).  I used the trial version and then deleted the program.  I have recently found something called Norton Ghost backups.  It is listed in My Computer under Hard Disk Drives.  It is titled Backup (D:).  I want to know if I can delete these backups that are left from 2006?!  I am a computer dummy Grandma.  Please help.  Thank you in advance.