That sounds like you are missing the Divx codec. You can get it in the free K-Lite Codec Pack Basic at http://www.free-codecs.com/K_Lite_Codec_Pack_download.htm (save to desktop and double-click to install), or if you don't mind a large download, you can get it bundled with the Divx player from www.divx.commikepd said:cant do avi.
it just brings up a blank screen