You might give this a try:
Fix for Software Update
See Troubleshooting Automatic Software Update in Mac OS X.
Delete the following files:
/Library/Preferences/com.apple.SoftwareUpdate.plist
/Home/Library/Preferences/com.apple.SoftwareUpdate.plist
/Home/Library/Preferences/ByHost/com.apple.SoftwareUpdate.xxx.plist where "xxx" is a number.
/Home/Library/Caches/com.apple.SoftwareUpdate/ (delete entire folder)
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