I am not sure what apple software you are talking about. If it is an apple computer, I am sure it has apple software on it and much of it may be needed. If not, maybe it is for the music. It is hard to say without knowing what the apple software is.
Safari is an internet browser. I-tunes is a music player. Quick time is a video player. You probably use other software for these. If you do not use these, you do not need them. You can uninstall these using the uninstall icon in their Start - All Programs folders or go to Start - Control Panel - Add/Remove Programs and uninstall them from there.