Hi adigiorgio.
Most green screens on video players just mean you don't have the right codec installed. Although you've done the right thing by getting the latest divx and xvid, these are not the only 2 codecs used, and many people are using many different ones these days.
I currently use a program that doesn't require codecs, but it's...awkward...to use. If you wish to try it, i'll supply a link. But if not, you can download this codec pack which has many many codecs that are extremely useful (i used to use it all the time)
www.sldcodec.net
there's a bit "DOWNLOAD NOW" button
