No such thing. The "best" registry cleaners require that the user know what he or she is doing or they will delete entries they shouldn't. Yes, they create backup files - but that pretty much defeats the purpose of using the registry cleaner in the first place in my opinnion.
I prefere manually scanning and editing the registry (after creating a backup copy, of course).
The above mentioned site for the reg cleaner is an excellent software that is not only free but also does a very good job of cleaning with back up. I never needed to use the back up. Just install and click on registry clean under do them all. When complete confindently press to select all entries and delete. Many programs installed when uninstalled either from the control panel or with the uninstaller that comes with them do not clean up the registry entries thoroughly. Reg Cleaner does it for you. Just try it I have been using it for a very long time and I am very happy with it.
allan is correct, if you don't know what you're getting rid of, your better off leaving the registry alone.
for instance, I use a registry cleaner that will in fact nuke my help and support unless I exclude the "help".
now, if you want to experiment, not only are there backup files, but again most of these programs send the files to the recycle bin, so, if the backup file doesn't work, you can return the files from the bin.
be forwarned, however, some items might become corrupt, adn you won;t know it for some time to come.
for instance, some restore points can become corrupt from this process...this has happened to me, and I presumeably know what I'm doing.
since that time, I ndon't clean the registry unless I'm very satisfied that I won't be needing a prior restore point, and then, afer I clean, I create a restore point immediately
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS