Preflight file error message.

I have undates available in the App Store but when I try to update I get the error message that the "prefilght" file is not signed by apple. What can I do to fix this?

Hello mgmccomy,
You might consider creating a test administrator account on the computer and attempting the updates there.
The first and easiest test to try is to see if the issue affects a different user account on your Mac. Each user account has customized preferences and other items stored in its home directory. You'll first need to create an additional user if one does not already exist (follow steps a-h below). Then, log out of the current user and test the issue in the new user account.
If this resolves the issue, there may be an issue with a file in the home directory of the original user account.
From the Apple menu, choose System Preferences.
From the View menu, choose Accounts (or choose Users if using Mac OS X v10.2 or earlier).
Click "+" (or click New User if using Mac OS X v10.2 or earlier).
Give the new user a name and short name.
Mac OS X v10.3 or earlier only: Click the Password tab, and give the user a password.
Mac OS X v10.3 or earlier only: Click Security.
Select the checkbox for "Allow user to administer this computer". This makes the user account an administrator.
Click OK, or quit System Preferences.
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/HT1199
Cheers,
Allen

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