Just to be certain, in your experience, Thief DP is actually crashing? Not where you launch the game, the screen goes dark and you can't see anything?
Are you using Thief Dark Project with no patches or Gold edition?
Take a look-see at these:
A few patches to allow the game to run at higher resolutions:
http://www.ttlg.com/forums/showthread.php?t=121449
Mentions setting a .cfg file to a certain resolution:
http://alt.games.thief-dark-project.narkive.com/R0FW9qAi/thief-gold-resolutions