The integrated video card is your problem. You definitely need to upgrade it. You should also read the System Requirements printed on the box or go to the game's homepage.
Post the wattage of the power supply and look at the sticker to see how many amps is on the +12v rail; usually defined as a number and the letter "a".
Here's an example of a PSU with two +12v rails:
+12v1 provides up to 10a, and +12v2 provides up to 13a.