Hard disc cleanup

My hard disc is rather full and whilst going through my files to see what might be deleted, I came across 2 Norton downloads and I'm wondering if I need them both?

N360-ESD-N0Def5-19-50-145-EN 26/8/2012           47,503KB

N360 ESDND-21-.5.19-EN 8/3/2015                          66,924KB

and Intelligent Updater uses 2007,788 KB!