right click and delete?

i want to clean up my desk top

which of these icons can I just right click and delete?

Installer can be deleted as you have already installed the program

I will not put shoutcut for the programs on the desktop if i dun really need them, as they can be found in the start menu

My icon conquer's half the screen of my 22inch monitor. Lol i think its time for me to clean too.