I own a 2007 macbook and I'm not sure what operating system-osx?- but I'm having trouble opening full episodes of shows on NBC.com. I can open Youtube videos yet when I try to open the videos at NBC.com, I get the download screen and see the icons of the episodes but they don't load when I click on them. Is there a codec or application that I need to install? (I already tried to install flashplayer.) Any help would be most appreciated.