Like TD says, there isn't really a way to do this on a laptop - especially for games like MW2 as they have very high requirements.
If there is an option for some A305 laptops to come with a better graphics card when you ordered it, then you may be able to buy a graphics module... this is only a possibility though. You'd need to contact Toshiba directly to see if this is possible. Even if you could do this, it would only be an ATI HD 3650 or something similar, which may not run what you are after.
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