farcry2 not working in dell inspiron 3542

[tcode]

I just bought the game (farcry2) but it cannot play in my PC. The games lags and it sucks. I think my graphics are the problem but I have not clue how to fix the problem

 

[ffg7]

Inspiron 15 3542 Specifications http://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-15-3542-laptop_reference%20guide_en-us.pdf