Okay, I downloaded movie from internet, it's 700mb, and I launch it. Almost every film now is 20 seconds long and on screen there's " Download *these* codecs to play it " or etc. So, I've downloaded all codecs, but anything happens. Still the same stuff, but it's impossible, that 700mb big movie is 20 secs. Please help me . Is it my PC's problem or the movies are bugged or fake ?

Sorry, mate, you won't get help with pirating here.