Cant Get Films On Itunes

Hi Folks,
It's me again, The problem now is I cant get films on my itunes library and so onto my ipod classic. I have been told I may need to find a conversion tool to convert the film file, but should itunes not convert any videos I have to the correct format?

If not can anybody reccommend a Free software download that I might try?
I downloaded a file last night called Xilliibit (I think) but it disabled my itunes.

try video-ra, its free and quite fast. it also gives you software to beable to download video's straight from youtube to mp4 format for your ipod