Alrite guys?

I need loads of help i am an X5 amatuer even tho i have owned 1 for a lifetime now! I have the 4.4 '01, nd apparently it is mkiii because of my disk drive in the boot.

What do i need to do to change this crappy blue nav screen into a shiny new 'os' is it? ( the nice black screen ).

The new version 26 is for mkiv rite? so which version do i get nd use, nd how do i do this WITHOUT messin it up because i am usure about ne FREE help from my dealer (finished warranty...i think!).

Please can sum1 help me upgrade it, because i h8 this duff blue piece ov ****. lolzz

Arya