In addition, should DC hang (or take an inordinately long time) scanning "Office Setup Files" (like it usually does here) you can merge the following regfile:
It is useful to hang on to your Office Setup Files themselves as while they're there you won't be prompted for the Office Setup CD-ROM while installing updates.
Also, as a matter of practice, before merging either Kelly's or my regfile, I do recommend exporting the HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches subkey.
I really am a firm believer in backing up the original key before deleting parts of it...