Right - the movie I, Robot wasn't actually based on an Asimov story at all - it was originally based on a screenplay titled "Hardwired" by Jeff Vintar. The screenplay was given a few concepts and characters from Asimov's Robot short stories. The Asimov "I, Robot" wasn't a story at all - it was the first collection of robot series short stories!
I wish Hollywood would leave Philip K Dick's stories alone - I don't think any author has had as many stories ruined by the movies as poor Philip K Dick.
Somehow prophetic that his brain exploded on the eve of the premiere of Blade Runner. He must have known deep down that was going to be the high water mark.
Now it has been ages since I read I Robot, and a neat story about a "Werebot" is coming to mind. I think I may have things confused and it may have been written by another author. Any ideas.
PS if you get the chance have a listen to Tod Machover's Valis an opera based on Dick's two books.