Adobe AIR problems

I could do with some help here.

Every time I try to access the Photoshop ( or Illustrator or Bridge ) 'Help' menu I get the Adobe help icon bouncing in the Dock. When I click on it I get this message:

'This installation of this application is damaged. Try re-installing or contacting the publisher for assistance.'

I've uninstalled and reinstalled several times but no change. I've also repaired permissions, ran Onyx & verified the startup disc.

I haven't noticed any other problems with the computer.

I can live without the Help menu in Photoshop but I'd like to get it working for Illustrator as I'm trying to get up to speed with the app & it's a bugger to learn.

My system:

Mac Pro 2 x dual core 2.66GHz 12GB RAM OSX 10.6.8

Thanks in advance

Graeme