Several questions about programs in my computer?

Well, I don't know much about Bonjour, IL Download, or Safari...but, Roxio is a program that you use to burn CDs/DVDs. Unless you're going to burn any songs, pictures, or movies onto a disc, you don't need it. If you already have Windows Media Player and iTunes, you probably don't need Viewpoint Media Player, either. Both WMP and iTunes will play most video and music files. If you other ones came with your computer (if it's a store bought one) then you can probably just get rid of them, as well. You can always do a search with Google or another engine and see what the programs are and what they are used for and use your best judgement.