A squadmate is experiencing the a similar issue (XP and 3GB Ram), can play all maps fine, but channel map kicks him out really fast. He tried all by now, but simply cannot fly over the straits.
A realistic advice: Get a new system, if you want to play the full scale of CoD, or stay off the the big maps. Hurts, but better than wasting endless hours, tinkering around.
In my experience, CoD used more or less 4GB RAM, running the game a dedicated on the same machine it for several hours, while testing, my RAM usage rises to 6GB. Even though I have 8GB Ram I expect the CTD launcher.exe crash the moment my RAM gets clocked up to a little bit more than 4 GB (1-2GB Win7 + 1-2GB CoD - even though I still have 4GB free).
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