Halo PC on Intel GMA 4500MHD?

Ok, I have a problem. My laptop (Gateway NV5815U) seems to not want to play Halo: CE. I've heard that the 4500MHD is capable of 30FPS at 1280x720 with medium settings. I know the 4500MHD isn't for gaming, but this video (http://www.youtube.com/watch?v=Lig4GQvxu2w) shows the 4500MHD playing Portal at high/720p! WTF? Halo should run. I don't get it. If anyone has a 4500MHD could they test Halo (Or get the demo) to see if they get decent performance (30fps+)