Question

where are the lectures

Answer 1

http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/

This is the newest - there's lectures from 2008 available as well, if you want to do more "homework"

Answer 2

I thought the lectures were in the zip file that I downloaded.

Answer 3

Nope, that's just the course material. The videos are streamable or downloadable as a seperate thing.