Kinda late now,...but for others with similar problem heres another way.....taken from the Readme file in the C:\Program Files\Microsoft Games\Flight Simulator 9\ folder.... ( All the way at the bottom ):
Installing Windows Media Player to View Videos
If you did not install Windows Media Player (WMP) while running the setup program, you can still install it. Simply place Flight Simulator 2004: A Century of Flight Disc 1 in the CD drive. The WMP files are located on Flight Simulator Disc 1, in \Redist\WMP.
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Accessing the Windows Media Player (WMP) folder and its contents
1. Insert Flight Simulator 2004: A Century of Flight Disc 1 into the CD-ROM or DVD drive.
2. In Windows Explorer, double-click the CD-ROM or DVD drive, double-click the Redist folder, and then double-click WMP to open the WMP folder.
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Installing Windows Media Player
• In the WMP folder, double-click the appropriate file for your version of Windows:
o Double-click MP71.exe for Media Player 7 on Windows 98.
o Double-click MPSetup.exe for Media Player 9 on Windows ME and Windows 2000.
o Double-click MPSetupXP for Media Player 9 on Windows XP.