Currently Being ModeratedOct 10, 2012 4:41 PM (in response to Sid G)
Go to system preferences > Software Update and make sure update options are all allowed. Then try again to run software update. Also check your network settings. Do you use proxy...? Are you using an Admin user account?
test running software update on a different user account.
Currently Being ModeratedOct 10, 2012 6:28 PM (in response to Sid G)
Are you running the App Store versions of iPhoto and iMovie? If not, you won't get updates from the App Store.