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Since getting this new computer i have been getting a disk error. The game will crash and a small box with disc error "imagefile186.pak" is displayed.
Sounds like a common problem with COD.

Anyone have any ideas how to stop this?

I was receiving the same error during the COD beta. From everything I could find online it had to do with a intel video driver that the game wasn't seeing correctly. I deleted and reinstalled and the issue went away.