Videoplayer / Downloaded player which does not play my file!

I purchased Videoplayer costing US$ 49.90 and downloaded it from the displayed site. After downloading and installing it, as I tried to play my avi file I got a message "This file is not compatible with your media player. To view this high quality format use the recommended Media Player. Please visit www.TorrentMovieSupport.com to download recommended Media Player.

Thus I got VideoPlayer at a cost of US$ 49.90 but it is not playing my file.