Lenovo IdeaPad U330 (2267-2BU) Specifications & review
Looks like you should have the ATI Radeon 3450 graphics model which is the better option for gaming.
It will likely run Call of Duty; but for CoD4 and higher you'll need to turn the graphics options down quite low.
In the Start menu, right mouse click on Computer (or My Computer)
What do you get for the Windows Experiance Index rating?
Click on the WEI link and list the ratings for each area.