I'm looking for a movie clip

[Poltergeist]

Specifically, (for my film studies class) I need The Picture of Dorian Gray (1945). I live in the UK and haven't been able to find a DVD of the film, sadly I need a DVD instead of a video as I have to give an analysis of the movie in class.

If nobody knows were to find a DVD, I'm lookinf for the scene were Dorian stabs Basil in the back of the neck after seeing the painting. All together the scene is (I think) around four minutes long

thanks