I had that same message when I tried to get on at about 7:50 east coast time. I just spent three hours trouble shooting my computer and then got on line for an hour to play Call of Duty with some friends. I just checked back in to see these posts and was I relieved you found the problem because I didn't find one on my end. First time I've ever seen the out of memory on IW. Thought maybe your Hard drive died again knock on Hardwood. LOL
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Remember these are just games so don't get too upset
when you get your ass handed to you in a hat box