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Here are a couple of links that might help:
http://forums.thesims.com/en_US/dis...n-game-crashes; http://modthesims.info/t/496339.
Do you have lots of store content? If so, it may be too much for your computer to handle - CAW, Sims3, and all the store content. You might want to try creating a new EA folder with no store content, then try opening your world in CAW and running EIG to see if that works. If it does, you may have to install only that store content you really want/need for the world. Sometimes lots of CC or mods create problems, too.
I clear all the cache files in both Sims 3 and CAW every time I plan to work in CAW. You can remove the files from the Worldcache file and the WorldBuildercache file, also. Delete everything out of Sims 3 DCBackup except cc.merged.package.
I've read that it helps some people - for Windows 7 at least - to run CAW and Sims 3 as administrator. Good luck with your problem!