MW4 Error, please help

This is my first post to these forums and unfortunatly, it is a problem. When I try to play MW4 with the training or campaign mode it brings up a dialog box saying "Invalid Allocation, 0bytes" And then I have to quit. If you need more information or have seen this problem before and might no a fix please post it. I have already tried updating my drivers and directX is at 8.0

Any help you can give will be greatly appreciated!

If you need more information feel free to email me at [email protected]