Gellion Dubrovna

So I recently got a brand new laptop. Vastly better than my old one in every spec, and it's shiny to boot. The only thing it can't seem to do is play SL properly. I'll be playing it for all of 10-15 minutes when the screen will lock up, and the window will say (Not Responding.) I've tried adjusting the video quality even though I can handle high without slowdown, but nothing seems to work. My old laptop could run SL perfectly with no crashes at a medium setting, so I can't figure out why this is happening at all. Little help? My specs are as follows: TOSHIBA Satellite P745, Intel(R) Core(TM) i5-2430M CPU @ 2.40 GHz, 6 GB RAM, Windows 7 64 bit, and an Intel(R) HD Graphics Family video card.