Where can I download Episodes of Glee Season 1 for free?

I bought the Season 1 last year and i was recently watching them and on Disc 6 the first episode on that disc keeps replaying, Even on the Jukebox where you can watch the music parts, when you try to watch one on the other episodes it just replays the Laryngitis episode. Please help I don't know what is wrong, and I don't want to download anything that will put a virus on my computer. Thanks!