Memory leak could be the cause but, your screenshot shows that launcher.exe is only 0.9Gb big and you have 4Gb of RAM so the limit of your rig has not been reached.
(I get the launcher crash when my launcher.exe is 4Gb big...)
The first thing to test is to delete all files at your cache and run CoD again. If you are lucky this will suffice.
~S~
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