Ok Barry, you question is an honest one and one that I will attempt to answer to the best of my ability. You did not mention what games you are playing or what other programs or applications you have running while you are trying to play, but you should know that laptops have their limitations when it comes to gaming and the best thing you can do is to make sure your computer is running nothing but the game when you are trying to play. Notebooks make for notoriously bad gaming rigs, but they can be tweaked a bit to get the last bit of performance that you can.
While you may have shared memory (and your computer does not have 448 of system RAM, that's impossible), the amount of resources you must allocate to playing games and doing what you want will depend not only on your system Ram and your allocation of video RAM but also how much free space you can free on the hard drive and how much RAM you can dedicate to gaming but turning some things off. For example, are you running Norton? If so, turn it of.
It uses lots of resources and this is what you need to play the game. You don't need it while you are playing. (actually you don't need Norton at all).
I looked over the specs that you gave and 256Mb of video memory is not terrible, but it is lacking in the most modern of gaming releases. You should not expect top performance with games such as call of duty modern warfare and black ops. This is why those that play games regularly on computers opt for desktops because they have the power to drive these games.
You can at least, get satisfactory results if you can free up some resources and play with your laptop, just don't be unrealistic about they type of performance your likely to get. Good night and happy gaming.
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