Hi mclovin. Like the name

The graphics card is good for Call of Duty: Modern Warfare 3 standards. The RAM meets the minimums. The problem on this laptop is the Intel Core 2 Duo T5450 1.66 GHz. MW3 requires a minimal of 2.4 GHz Intel Core 2 Duo to run. If you had a 2.2 GHz Core 2 Duo you might be able to run it at the lowest graphics settings with some tweaks, but the 1.66 GHz Core 2 Duo will run MW3 very laggy during battle. It will be unplayable.
I recommend taking your Toshiba to a laptop shop and asking how much they would charge you for a processor upgrade. The MW3 minimum is a 2.4 GHz Intel Core 2 Duo but I recommend asking them what is the fastest Intel Core 2 Duo processor you can upgrade it to and have that one installed. If you still have some extra cash after the CPU upgrade expense I recommend upgrading to 4 GB of RAM. That RAM will help with overall system performance, not just MW3 gameplay.
Btw, if they say they have other Intel CPUs they can install, DO NOT install a regular Intel “Dual Core” or Intel “E” series dual core processor. Those CPUs are SLOW for MW3 gaming. An Intel Core 2 Duo 2.4 GHz processor will run MW3 as fast or faster than an Intel Dual Core 3.6 GHz processor.