I had a old laptop that I wanted to update... and I updating/upgrating each software at the time... so when I reached the time for update CCleaner... I've found something interesting... I had installed CCleaner version 2.13.0.720 and I installed 2.16.830 over it... and many many of the old CCleaner files that in the newer version don't exist anymore weren't erased but kept in CCleaner folder...
I have to uninstall 2.16.830 and the unistaller did the job of erasing almost all files from the folder (the only one kept was winapp2.ini and I will make a suggestion after posting this about that) and then install the new version...
CCleaner installer should uninstall the current version before installing the new one to avoid keeping these old files forever... Same thing for Recuva and Defraggler!!!
Windows XP SP3
Update: here is the suggestion I made http://forum.piriform.com/index.php?showtopic=20229