In my efforts to deploy office 2007 to my workplace, I used the Office 2007 Customization tool, which is available by running Setup.Exe (on the disk) with /admin switch applied.
I went through and spent alot of time considering each and every setting and selecting what I thought was best, then went to save my hard work and received this error:
I had no idea where this error came from, and a google search returned nothing.
So I experimented saving at regular intervals, and found that the error seems to be coming from the 'Office security settings' section, in the bottom box whenever I enabled 'Microsoft Office Excel - Application Add-ins warning options' it seems to crash. I just did not configure a setting from this and all seems to have gone well.
I'd say its a program bug, best to steer clear of that setting.