[DRG]

OK try this

1]Turn off all sound and let me know if this makes a difference and..

2] try running the game in windowed mode instead of full screen and let me know if that changes anything

Also, note what Andy said above...

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In reading the Dell website - the Inspiron has a "shared memory" graphics adaptor, and not a stand-alone video card with at least 32MB of dedicated video RAM, as we specify as a minimum requirement in the GG. That could be your problem - you dont have a "real" video card. As you cannot fix that (since it is a laptop) - see if changing the amount of shared system RAM assigned to the card to a larger amount helps.
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The game may simply be too much for your machine to handle with that shared memory graphics adaptor but try the two things I mentioned and let us know if you see a change

Don