Have a DELL Lattitude D825 with WinXP Pro SP2 - all updates. Had an issue getting an AVI file to play. Ended up downloading the Divx codec from www.divx.com
and that worked to play in WM11.
However . . .
The user is trying to insert the video into Power Point 2003 and all that shows is a black box and the audio plays, but no video. I tried inserting the same video into my computer's PPT and it did the same, but upon turning down hardware acceleration it played. Not so on the DELL computer in question - it still plays only audio.