Errors and Crashes Reported with Call of Duty 5 World At War

As some of the cases reported in communities,

1. While selecting the mission Hard landing it says "Click to start mission." But then the error showns "dwwin.exe Application Error"
2. Fastfile for zone 'code_post_gfx' is corrupt or unreadable.
3. "Error during initialization:
   Video card or driver doesn't support UBYTE4N vertex data."
4. "directx runtime had encountered an unrecoverable error"
5. Start the game and after selecting the difficulty level and selecting the mission there is no option to play the mission.
6. when clicked on COD5mp when connected to the internet it crashes once the menu appears but when disconnected it works offline.
7. Fastfile for zone ui appears corrupt or unreadable(code 107)

Best solution is to buy the game!!!