I quickly looked over the uninstall-routine, and it does check if the files exists before trying to remove them - and only adds files that exists and can't be removed to the 'try to delete again' list.
Try to open the "TryDelete.dat" file in the installation directory (if it exists - if it doesn't ZSoft Uninstaller has registered that the files are gone (for instance by removing them then next time you ran the program)).
If it exists, try to do a search for those specific files, and see if they are not actually still there...
Would it be possible in future versions to summarize what files and strings the program thinks couldn't be deleted?
Yes - a list over what files are not deleted (a 'visualization' of the "TryDelete.dat" file) is on my todo list

Administrator - you might also like to know the program is discussed very favorably in the CCleaner forums.
Weee, last time I read the CCleaner forum the program was bashed pretty heavily
