Wow! You are in a pickle. You can't just divine an
Office 2008 installation from the ether. You might try downloading and installing the updates from Microsoft's
Office 2008 website. Hopefully, one of them will reinstall the
Setup Assistant. If not, then you need the
Office 2008 installation disc.
Now, here is where things get nasty for you. It is my understanding that the
Office 2008 installer requires
Rosetta. If this is the case, then the installer will not run on recent releases of OS X.
The Big Picture
For those who have considered using
AppCleaner or another such utility, let this be a lesson to you. It is not needed and should not be used. Such utilities do more harm than good. If you want to uninstall an application, then use the developer's uninstaller. If no uninstaller is included, then none is needed. Use the Finder.
ccarroll57 made the mistake of using
AppCleaner so that you don't have to.