If I were you, I'd check every executable you can in the Thief install directory, making sure they're all set to compat mode.
That's the only thing I can think of. I really doubt that the game is freezing up because of an issue with DX in XP - I'd think it's more of an issue of the game not wanting to let itself run.
Probably something you've already done, but: Have you checked for updates to Thief, see if there are any patches for getting it to work in XP?
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