Well,
There is good news and bad news.
If you want to look at your spec's check them out
here This was the newest version of the Inspiron 1150, so I'm hoping this is the one you have. If it is then congratulations you shouldn't have any problems playing this game. However.....
The bad news is if you happen to have the older version that comes with the 2.4 GHZ Pentium 4, you might be in trouble. Those systems come with the first version of the Intel Extreme Graphics processors. That graphics processor won't run this game, and there's no real way to upgrade because its just a chip, built right into the mainboard.
So anyways, if you want to check click:
Start > Control Panel > System
Under the general tab at the very bottom will tell you what processor you have and what speed it is. Keep your fingers crossed and hope that badboy clocks at 2.6ghz. Then you can post back here if you need anything else.
I hope this helps you, good luck, and godspeed.
-$.02