Two fallacies - orphaned registry entries have little or no effect on performance, and secondly, having orphaned registry entries have never ever caused me any problems - in fact I've never used one at all in 25 years of using Windows.
I'm afraid your assertions are a) wrong and b) in inexperienced hands down right dangerous.
25 years??? !!!!!!.
Do you really think that other members of this Forum believe your claim, I certainly don't.
Why is 25 years hard to believe? I have no trouble at all understanding that. 25 years ago (1989), Windows had been out for over 5 years. The first computer I was trained on was in 1968 My first home built was a Intel 4004 in 1972. In the following 40 years I have never used a registry cleaner to fix one of my computers. Nor have I ever used on to fix a client's PC. I have had to recover the messes that clients made of their PC's by using registry cleaners plenty of times. I've lost track, but certainly in the hundreds, and at least four times in the last month alone.
Out of curiosity, I have introduced various errors into the registry and tested various registry cleaners. Most failed miserably. I advise people not to waste their money on them. While they did slightly improve performance on XP, if a PC is improved by a registry cleaner, you most likely could gain a lot better performance by uninstalling the programs or re-installing windows. As others have said, the chances of making matters worse by using a registry cleaner are pretty high. If you can't solve a problem any other way, and you don't have time to rebuild the OS, then MAYBE, try CCleaner. Look at what it is going to change and then just apply one or two changes that seem to be related to the symptoms you are having. Most problems today on 7 and 8 can be solved with restore points. Registry cleaners are outdated.
I have to agree with the ones here who say they are snake oil.
Hi Bob.
I really enjoyed reading your reply. I believe the majority of computer users at one time have in fact purchased (mostly on line) a registry cleaner. But did they take the time in researching the product they were going to purchase? (Pros, Cons, availabilities of trial periods, options/choices in the operational procedures and other options of that registry cleaner and so on. Price is also a factor to consider !, sometimes paying a bit more, will give you a better and more stable product. Sometimes, also buying from an oversea country ( United Kingdom or a European country ) will reward you with a better product.
I, for example purchased my registry cleaner from Finland. I did my home work/research and was rewarded with a good product. It has never let me down nor mess-up my system or my clients PC's(except for once, when I intentionally ignored it's warnings, cautioning me not to delete 3 registry Values, doing so could damage the proper operation of my system. So theoretically, I'm the one who mess-up my system, by intentionally ignoring it' warnings, not the registry cleaner ).
In conclusion, not all registry cleaners are "Snake oil". Not to forget, I also use "CCleaner", but no LONGER for registry cleaning. It doesn't even achieve 15% of what my registry cleaner cleans ( Registry Values ). I like the "CCleaner" but only for other cleaning functions.