movies i bought from the itunes store and they wont sync to my ipod

I had bought an ipod for my daughters birthday n i had purchased several movies from the itunes store and they downloaded n they show up in my library n wheni check them to sync to her ipod....it shows a pop up block that says that it cannot be copied to this ipod cause it is not supportrd by this ipod. my baby is really wanting to use it n I downloaded the itunes 10 & updated her ipod software to 4.3.3 i think that i did all the necessary updated and downloads now what do i do...i've been on this comp eversince 11:00am this morning and it is still now 1:29am....i dont know....if anyone has any suggestions..they r welcomed