Are you aware of which registry entries if deleted will cause problems? if so does CCleaner flag them to be deleted? if not then the program is working for the average user, if it does flag them then it should not, or take the option away to delete the entries altogether. Users are just following the steps that the program options offer and if delete registry entries is there then they feel they can delete them. You can't put a penney in a fuse panel anymore because people did when they ran out of fuses, if you feel it is so dangerous to delete entries then take the option away it is so simple. remove the option or don't flag the entries that can cause problems.