Oh, I found this in Adobe.com
Linky
Issue
When you use Pathfinder commands, the knife tool, or other operations in Adobe Illustrator CS2, the application crashes with the following error message, "The application Illustrator has unexpectedly quit. Mac OS and other applications were not affected." Other operations could include Copy and Paste, scaling, moving, or others.
Details
You are running Illustrator CS2 on an Intel-based Mac running OS X 10.4.8.
Solutions:
Do one of the following solutions:
Solution 1: Restart Illustrator with the Appearance palette hidden.
1. Start Illustrator.
2. Deselect Appearance from the Window menu.
3. Quit and restart Illustrator.
Note: You can show the Appearance palette after you have restarted Illustrator.The adverse behavior may re-appear in subsequent working sessions and you may have to repeat Solution 1.
Solution 2: Run Illustrator in Mac OS X v10.4.7 or earlier.