i have recently bought a new computer. trouble is that when i go to add my new library on itunes to my ipod it wont let me press "update ipod"

if anyone understood that help would be appreciated.

Its a method of copy protection. Each download of itunes has a signature which is associated with your ipod. If you want to get round it, download your ipod content onto your computer using Sharepod and reset your ipod! Alternatively sharepod might let you upload from your new computer to your ipod in 1 go - have a mess about with it!