Reporting back: I fixed it.
Reason is still not clear. But somehow I fixed it.
From all the mess I've gone through, I would assume the reason is NOT graphics related, nor TWoS. It seems it's the registry had some issues.
Clean the registry completely. Always install with CD/DVD. NEVER just move the game elsewhere and then copy it back.
Anyway, thanks for the help to everyone! Cheers!
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