I am unable to play games like Crysis 2, NFS, and IGI 2 even on this configuration !!

I recently purchased a new PC with this config:

But still I am unable to play these Crysis 2, NFS, and IGI 2 low requirement games !!
All the games lag alot !! and my cpu starts sounding like it is to blast now.

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Please tell me what cound be the problem

 

Sadly, your graphics card sucks.

http://www.notebookcheck.net/ATI-Radeon-HD-4250.29664.0.html

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You need a much better GPU, but since it is a laptop GPU we are talking about, you need to buy another laptop with a better GPU.