Perhaps your file did not download correct. I have it and it unzipped and plays fine. Delete what you have and redownload it without interrupting the download such as going to sleep mode or closing the browser.
Maybe you need to download winrar or 7zip or another .zip extractor program. Last ditch effort is perhaps you don't have enough room on your drive as the file is around 6 gigabytes. (Does your drive have a bad sector?..)
