I'm thinking all your problems are stemming from how you got the game onto your machine (copied all the files from one machine to another over a network instead of going through a true 'installation' with the discs).
By doing it this way, I believe some key entries were not written to the registry, thus causing the game to function improperly.
So I would suggest doing a clean reinstallation of the game using the discs then load your custom UI back on and see if your problem remains.
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