Another bug in Microsoft Office 2008 that I just discovered (and which is not listed on their Known Bugs page) is that if you install on a disk other than the startup disk, the installer stupidly puts the Fonts, Automator, and Application Support folders into the install disk's /Library, rather than the system disk's Library (i.e. in the root /Library folder), which is where all the apps look for it. So when I installed Office 2008 this way, none of the apps could find the Help app, among other problems.
$ cd "/Library/Application Support"
$ sudo ln -s "/Volumes/Installed disk name/Application Support/Microsoft" .
$ cd ../Fonts
$ sudo ln -s "/Volumes/Installed disk name/Fonts/Microsoft" .
$ cd ../Automator
$ sudo ln -s "/Volumes/Installed disk name/Automator" .Mac OS X Hints
http://hints.macworld.com/article.php?story=2008022623072423