I have used System Ninja, CCleaner, Glary Utilities, and privazer and they all do a good job. Each finds more stuff than when used alone.
I will stick to what I have been doing so far.

#6 Giovanni
. . . (Portable) Privazer (by the way, far better than CCleaner)

Really? - could you explain why it is so much better?
Thanks.

Good to see you back by the way. :)

"Because I use XP I can still use ERUNT..."

ERUNT works quite well in Vista. ("Windows XP/Vista/7
32-bit program. Can run on both a 32-bit and 64-bit OS.")

#3 Iliyan says "Sorry that Microsoft does not made such program – may be it is useless or dangerous?"

#7 XP-Man says "With the introduction of the registry Microsoft introduced software into their OS that can totally cripple it."

Exactly. This made me smile. :-)

Even if this software came from Microsoft, I still wouldn't use it. They're to blame for not providing a real operating system in the first place.

As a retired software developer I cannot comprehend anyone thinking any piece of software can make across-the-board cleanup decisions. The way these programs make money is from those who don't understand that. And then the Fix-it Geeks make money wiping and reinstalling Windows.

Look at the one on TV. A customer walks into a business and has the cashier use a web site to fix her POS system. She should have been fired on the spot.

The truth is that the only people who should even touch a program like this are those who know not to use it without a lot of human interaction.

Sorry, didn't download it. I've stopped trying new ones -- every time I compare 2 or more cleaners, I never get the same results from the same type of scan, especially registry scans. I have a popular free cleaner and just let it report without changing anything automatically.

Be careful with Privazer (#6 Giovanni), it is very good indeed, but I keep to CCleaner as Privazer actually removed too many things and I lost settings and other things for my software that I considered useful and mostly harmless.

Actually Bruce Schneier the great security expert uses Privazer, so that is alone a very good recommendation, but it is just that I found it cleared out too much for normal use.

CCleaner and the combination of Wise Disk Cleaner & Wise Registry Cleaner are all you need.

On modern Windows 8.1 , programs like this are snake oil and do no harm than good. It doesn't "speed up" your system at all.

I use Wise Registry Cleaner (freeware) which also has a backup and restore of registry function.

As a rule, choose the less aggressive registry cleaners.

The most aggressive registry cleaner I have tried was on 12 Aug 2012 at about 5pm. It was a giveaway software named Software4u Registry CleanUP. Apparently it was a German software. It reported 51,410 errors in the registry. The number was incredible.
Since I had a backup in Acronis, decided to clean accordingly as recommended to see what may happen.
It crippled the computer.
Did a restore in Acronis.

Many of you use the fear factor in using something like this to clean your registry. I get that. Over the years all we hear about is backing up your computer. How important that is. And yet folks will not do just that. They will use registry software and complain when it is too aggressive. You can also use something like Toolwiz Time Freeze (free)to experiment and not lose any important files if the software takes out files needed. I thoroughly clean my PC before doing a backup image of it (free software). And that includes free Regseeker which has never failed me for many years now. I just don't like hundreds of unnecessary files being left behind after an uninstall, using Revo Uninstaller or any other free program. Use free Search Everything after an uninstall of a program and it will find at least a few if not more, files still on your PC.

Downloaded and installed with no problems. It seems to work as promised. Didn't take long on my computer to show the scan results and there wasn't much to see. I just don't see why it's needed when I have some better GOTD programs. Wise Care 365, Win Utilities and of course CCleaner. I use them often and that maybe the reason why my scan didn't take long. If you need a registry-cleaner try it out. Just do a file backup first.

@6 Giovanni: thank you to get back. We have been wondering these days where you have gone. Please stay here and make you great comments.

With the introduction of the registry Microsoft introduced software into their OS that can totally cripple it.
In my mind this is inexcusable, as a user you should be ale to have confidence in the stability and longevity of their OS, but no piracy was costing them a lot of money so they introduced this monstrosity, the registry!

We have to live with it and have to be very careful when messing with it, so use registry cleaners at your peril.

Having said that, I have used Wise Registry Cleaner for years, I had to keep my download speed at a reasonable level when I had a slow connection, half a meg, cleaning up the MRU made a huge improvement, but I only used this registry cleaner in the "safe to remove" mode.
Because I use XP I can still use ERUNT to backup my registry without problems, apparently it is still possible to use in Windows 7 but you need to do workarounds.
For those of you who have moved on from XP a program called RegBak is said to be a good substitute for ERUNT, obviously I cannot vouch for this but it is available at the following link:-
http://www.acelogix.com/regbak.html


If you are going to mess around with your registry make sure you know what you're removing, or better still do a backup that can be restored outside of Windows.

This developer is specialized in producing decent software which are always replaceable with better FREE alternatives...and I wonder why!

How can he make money in a SUPERSATURATED field like this and others is a mystery to me.

For instance today's giveaway is just an ordinary Registry cleaner which is not worth downloading even as freeware, in my view.

Why?

Because (Portable) Privazer (by the way, far better than CCleaner) does much much more for FREE:

http://privazer.com

See also:
http://www.registryrecycler.com/features.html (==> Excellent FREE Registry Cleaner & Optimizer)
http://www.auslogics.com/en/software/registry-cleaner
http://www.wisecleaner.com/wiseregistrycleanerfree.html
http://www.hlpsoft.com/product/free-windows-registry-cleaner.html
http://www.softpedia.com/get/System/System-Miscellaneous/IObit-Toolbox.shtml

Enjoy!! ^_^

Download and set up was very quick and easy to do on my Dell N5050, simple UI with an options and scan button, just hit the scan button without checking out the options to scan a 250 gig new hard drive with a fairly fresh legit Windows 8 instal, after 30 minutes of the progress bar getting to the 3/4 mark many times the scan restarts scanning the same files after the 5th time got tired of waiting so canceled the scan, now uninstalling,

Installed and registered without problems on a Win 8.1 Pro 64 bit system. Double checked eMail...

A German company with address&phone. From Backup over Birthday reminder to the different washers. We had a lot of their products in the recent months.

The software is from November 2013.

I started the washing process. A small to full size resizable window opens, you can change the language under "file", not in the "options".

Under options you can define, where to search for orphans, a little bit confusing and unstructured from "last wordpad files" over "old Active-X files" to "uninstall entries". This should be washed again.

During the washing process the found registry entries are display. Due to the small window crippled. The process takes a long, long time. This is the longest washing process, I have ever seen.

Oops, I think the process loops. I repeats several times after "the last excel files". Yes, indeed! the program does not end properly.

Just check it out: you will be surprised how many old sins this program finds on your machine. And do not be shocked when it will be more than some 100 or 1,000 entries!

My registry is "clean" to a certain point. I used the Wise Registry Cleaner before this test - and the Ccleaner (on my virtual system). I do not wash to often... the colors are bleaching out.

Okay started again and checked only DLL,OLE,ActiveX. The program end correctly and displays the found entries in a clear way. In my case 2 "missing files" and 8 old OLE entries. You have to define, what should be cleaned. In this case you need some knowledge.

Makes a mixed impression (see the loop above) - but does not find hundreds of "wrong" entries. That's good.

But what do I do now with my wet registry. Is there a dryer??

Difficult to judge. The reports and logs are good.

Be careful using such programs! 3 years ago i stopped trying registry cleaning programs bcs i realized every time happened something wrong with my windows. Sorry that Microsoft does not made such program - may be it is useless or dangerous?

Anything that has to do with Registry "Clean Up" needs to be used with caution. Make sure you have a recent complete Drive C: back-up and additional create a restore point be for installing this program. A Registry "clean Up" with an aggressive program can leave a computer inoperable. Microsoft advises against these types of programs as they can do harm. I have not tried this one. I currently use Uniblue's Registry booster which is very gentile in selecting s few entries to be corrected.