I'm using windows xp, and media player 11 to stream music and video to my 360. I have alot of mpeg and divx videos. after downloading the dashboard update and optional video update my 360 now sees all my video files. before they would never even appear in the list, now they show up, however most won't play, they have a red circle crossed out around most of them. about 2 of 80 will actually play. what program is good at converting these to the right format and does it quickly?