I have a user that is getting this error near the end of the install:
Run-time error '-2147024770 (8007007e)':
Automation error
The specified module could not be found
[ OK ]
I asked them if they were doing anything unusual, they said no. They sent a pic of the error - this looks like a windows XP system with the classic theme, but might be Win2k (can't remember precisely what screen looked like). I do have some custom actions, including launching an executable file, but I've never encountered this issue before in the course of over 10k installs...