Apple crashes

Useful link on to help find corrupt files.

http://www.pcworld.com/article/156095/delete_files_to_prevent_crashes_in_os_x_1056.html

Apple system update - Network error

Error: Your network settings have been changed by another application
when trying to change the network preference, it locks up.

Fix:

Go to Library/Preferences/SystemConfiguration and delete the following (suggest make copies to the desktop first if in doubt):

com.apple.airport.preferences.plist
NetworkInterfaces.plist
preferences.plist
com.apple.nat.plist

All these files will regenerate as necessary when the associated system features are accessed. If you're using Airport or Internet Sharing you'll have to reestablish the appropriate settings, because these will have been lost when the preferences files are removed. Small price to pay, however for a permanent, and very simple solution to this irritating problem."