In exceptionally rare cases, deleting invalid or unneeded registry keys can fix problems. There are even rarer cases when using a registry cleaner will improve performance. I can think of three cases over the last twenty years or so when I've fixed issues by using a registry cleaner and once where there was a noticeable improvement in performance. So it is very rare for a registry cleaner to be of any use, but there sometimes are exceptions.
If you don't change software a lot you don't need to use registry cleaners, but if you install and remove software all the time, you will find that some of them left items in context menu, services, startup items, etc. I try software a lot, and I find leftovers after software removal, but you need to just clean what you are sure you removed previously, not every entry comes out.
These type of programs can have its uses in cases mentioned, but to run them frequently as a "cleaner" or a "repairer" is a wast of time. Errors you repair - not clean. Cleaning you do with crap - not errors. Hence the; There is no errors! Never has been.
And errors is a misnomer since there is problems these type of programs handle. So are the word cleaning which implies that it has to be cleaned like crap, as with crap cleaners. This whole bransch is and was shady. If one wants to fix problems with the registry, one can use programs like Registry Finder and such when necessary. But - Registry Cleaners, has outlived themselfs. It is for people with to much time on their hands.
