Corrupt files at start up

Hello. Ok, I cant seem to get this to work.
The splash screen loads, but then I see a message saying (The requested is corrupt or cant be found " " ) it gives NO file name. Just " " for the file.
Ive done every solution on the sites and then some. Uninstalled, both dirty and clean installs. Rebooted, refragmented, updated all video drivers, Im the administrator, no I dont have IE7, Direct X is fine, Ive deleted the fs9.cfg and it created one, but no luck. My Doccuments is the default one, yes I have the flight simulator files folder, CD#4 is in. Ive deactivated the Nvidia device helper.
Nothing has seemed to work...BUT
I can only start it, if I go to the FS9 folder and double click the fs2002.exe. Then it will run.
Is there a difference between the two?
And how can I tell what file is missing or corrupt the pop up just lists " " as the file.

Thank you in Advance.
Javier

AMD64 3500+
1gig ram
6600gt pci express vid card (latest drivers)
Thrust master (top gun afterburner force feedback) which wont work in the game.