Can't download music to iPhone5?

So whenever I try to download music from my itunes (dell laptop) to my iPhone 5 I always get this message.

"The iPhone can't be used because it requires iTunes version 10.7 or later. Go to itunes.com to download the latest version."

I always used to download music from my 2002 ipod to my computer and it always worked so i'm guessing it's not my computers fault. How do I fix this problem? How do I download the latest version of itunes onto my iphone 5 or be able to download music onto it?

Http://www.apple.com/itunes/download/

Download From Here and its not your computer fault just update itunes version.