Why isn’t iTunes video playing on Vista?

Hey friends, I see that there are compatibility issues with itunes and vista. I really didn’t had any problems playing itunes purchased music, or any other problem. The problem that I face with iTunes while I am using it on Vista is playing iTunes video. The audio I play on iTunes works absolutely fines but when it comes to the videos it barely works. The video struggles a lot while I try to play it and most of the time iTunes gets shut down by itself. Can anyone explain me about this weird behavior of my system? Any reasons for this? Any solutions? It has frustrated me to such an extent that I feel like throwing it away.