Hold on... advice to someone downloading from 1337x !!!
Until I saw your comment and googled the term, I had no idea that this was a "downloaded" file. I assumed the "1337x" reference was to dimensions/resolution and Noir referred to genre. (I.e., I use similar notations the differentiate files compressed for TV playback comparisons.) In any case, the advice is the same irrespective of the source.
er, isn't it illegal to download movies ?
Not necessarily. Thousands of movies are probably downloaded daily as legal purchases from such vendors as iTunes. Thousands more are available for free in the public domain, open source/community videos listings, and under Creative Commons Licensing. In short, there are many legal sources of downloadable content and you should not automatically jump to the conclusion that everyone is a crook.