People with the DX error just have to update directx 9.0c to the latest version.
People with only a black screen at start can simply throw away the bik video file, the game just skips this intro and continues loading. (c:\program files\activision\cod5directory\main\videos\ EMPTY THIS FOLDER)
Now all we need is the solution for the error that shuts down the game at start and gives a microsoft error which askes you to send or dont send.
I have another solution for everyone out there getting the black screen that has worked every single time for me. Simply Alt+Tab out of the game, then Alt+Tab back into it. Just hit ESC afterwards and the intro screen should start right up. Worked for me everytime so far, but I'm using Vista, so I'm not sure if it works for XP.
Who knows? So far the PC version looks unworth investment, this is the tech forum and as of yet I havent seen a bit of help from the techs, I might buy the 360 version but the roundhouse glitch has not had much tech answers either, are they just too busy to answer questions that have been presented? Maybe they are finishing up mission #1, they must have lots of promises to work on.