As you've found, 'uninstall/reinstall' of complex apps rarely changes things
on a Mac -- at least not for the better
When an app fails to launch the
first issues to address are: (A) Updates & (B) Repair of Disk Permissions.
Since you didn't specify your current update levels of Office that's the
first place to start... Confirm that you're at 12.2.3, then run Disk Utility
- Repair Disk Permissions & see if things don't improve after a restart.
If you continue to have the problem please provide a more complete
description of how you are attempting to launch PPT & exactly what occurs
when you try. Are there any error messages? Details are important.
HTH |:>)
Bob Jones
[MVP] Office:Mac