Make sure that you have enough hard drive space. Or it *could* be your graphics card or that your card doesnt support direct x9c.
Give this a whirl to see if the game will run
http://www.lucasforums.com/showthread.php?t=156634)
Then run a dxdiag. To do this, follow my simple steps
Click START
then RUN
a small box will pop up
type dxdiag (as it is there, NO caps, no spaces)
give it a few moments. if it asks you to digitally assign anything, click yes and wait. It could take a while, depending on your PC.
Can you please then post the results from the first page (copy and paste it) and then all the info from the Display page(Small tab at the top) in our Tech centre forum and I will take a look
DMUK