Which of the following laptops should I buy?

I am a chemistry student, so I will be running highly computative molecular modeling softwares, so I need good memory on my laptop. I will be watching movies and I will defenitely be playing low spec games like first halo, wow & guild wars. So, I need your help, tell me which laptop should I buy.

Hp Special Edition

http://www.bestbuy.com/site/olspage.jsp?skuId=8782089&type=product&id=1204924952362

Thoshiba Fusion Edition

http://www.bestbuy.com/site/olspage.jsp?skuId=8770564&type=product&id=1203815922613

And can u tell me the difference between the processors in each laptop.

Neither, I'd really recommend getting a dedicated card even though you will be gaming light. This ACER is $50 more:

http://www.newegg.com/Product/Product.aspx?Item=N82E16834115454

It has an 8600GS which will run even new games on medium/high, as well as help smooth out your video editing. Acer is a solid brand like Toshiba and HP as well, you can feel comfortable giving them your money.

If you're dead set on the two you stated however, go for the HP. The 7150 is better than Toshiba's x3000, and besides, the HP looks cooler.