Just asking that you read the forum note so I don't have to ask those questions. My thought is about drivers for the machine such as motherboard and all others. I can't comment what versions I would use since there is no detail in your post.
I am running 2000 professional. When I try to run video in media player 9 or any other player such as quick time, they open and begin then the video goes blank and the player freezes. If it alt-ctrl-delete and select task manager it begins running correctly. I have removed and re-installed each of the players with all updates?
Thanks for any help you may have!