Issues with updating apps on ONE iMac - please help!

Hello everyone
I use an iMac at home and at work.  At work, firewalls or similar have been stopping my apps being updated and also accessing the itunes store
I brought the iMac home at the weekend so I could bring everything up to date.
However, the itunes stuff downloaded immediately. Two apps from teh store updated quickly too.
However 6 other apps would not update - I kept getting a null message.
After a few attempts I have been getting teh following message for all six apps. "The product file could not be verified It may be damaged or was not signed"  I have tried updating all and doing them individually.  I even tried deleting one app completely to reinstall but the same message came up everytime.
The apps range from Final Cut Pro X to Angry birds so it's not like they even just apple ones.
Anyone able to help me?
Thank you
Chris

"The product file could not be verified It may be damaged or was not signed"
OS X Lion Update 10.7.4 (Client Combo) may help Chris. Restart your Mac after the combo is installed then try updating your apps.
Make sure you are using the same Apple ID for updating that you used to them with.
It's ok to do this even though you are already running v10.7.4 on your iMac.
I even tried deleting one app completely to reinstall but the same message came up everytime.
If you just dragged the app to the Trash, that does not remove all the associated files.
Use this free utility >  Download AppCleaner for Mac - Uninstall your apps easily. MacUpdate.com
edited by:  cs

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