This is an exact echo of another posted problem, however, the solution does not appear to be the same:
"I'm running Win XP Pro & have some AVI/WMV/(others?) files that wont play the video (just see black screen) but they play audio. The same files play fine on other W2K & XP PCs. I checked the codecs and they seem fine. I also tried updating Media Player on my XP PC, also tried re-installing Media Player 9, tried uninstalling & re-installing...no luck on this one problem XP PC.
Media Player on this PC also doesn't play .WMV files - no video - just audio."
I am also unable to play DVDs, experiencing this same problem
The resolution for this issue posted on EE was that the video was displaying on the secondary monitor. however, my computer is not set up to display on a second monitor. Also, If I try to select a different monitor, I am not given an option.