my iwork does not open despite a reinstall

My iwork does not open either and this is with an update. Am on Mt. lion. I never should have updated the thing as it will not open now. Any ideas on what to do?

For Islick, did you update iWork as well? The versions I'm seeing in the Store require Lion at least.

And for Walter, maybe you're on the opposite side of the fence. Your iWork apps need to be updated to work with that cat.