As a further adition to the last users post, if you still have problems playing certain video files after your codecs are updated try VLC ( www.videolan.org/vlc/ ) which is an ecellent application for playing damaged video files or simply as a way of previewing videos before they are complete, avi preview is another fine example of such an application. As for general media playing i run the free version of inmatrix's Zoomplayer ( www.inmatrix.com ), again, hoping this helps.