It should work, as Ego Draconis workked for me with a similar set up and The Dragon Knight Saga has better preformance.

Vista 32 Bit
Intel Core 2 Extreme CPU X9100 (3.06 GHz)*
nVidia GTX260M
4 GB of RAM

*Has two cores like yours and about the same speed.

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You may want to turn on both options about time slice in the graphics menu, they do not change the appearance noticalby and improve preformance. For some options that are not directly supported (frame rate above 30 and Anti-Alising) have a look at: http://forums.impulsedriven.com/400176