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On the home page it listed...

Don’t make it worse by installing PUPs

Registry cleaners, defragmentation software, and other “speed up” utilities turn out to be potentially unwanted programs (PUPs) more often than they are useful.

I'm using CCleaner, I've found it a good timesaver, but now I'm worried about installing PUP's. I know nothing about computers other than using them. Is CCleaner safe?

Edited by AdvancedSetup
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Many of the articles you read online were written some time ago; and CCleaner has changed.

To start with the 'other software' offers made during a standard install of CCleaner now have very large 'Accept' and 'Decline' buttons, no one can say they are sneaking up on you anymore or claim that they 'missed' seeing the offers.
The other Piriform Products such as Speccy, Defraggler, and Recuva no longer offer bundled software at all.

The Registry Cleaner in CCleaner has been problematic for a while, it's intended for advanced use but because the button is prominient non-advanced users tend to use it daily/weekly and some do end up messing their registry, especially with Windows 10.
As said Registry Cleaners do have a use, but that use is not regular daily/weekly cleaning.
Here is CCleaners official advice on it's registry cleaners use, you'll note the promise to move it into the advanced tools section where non-advance users as less likely to play with it:

The 'new' Driver Updater in CCleaner is another matter entirely, who knows what they were thinking when they included that?
Don't use it, don't touch it with a bargepole, on the CCleaner forum we are regulary seeing complaints from users who have 'broken' their machines using it.
Though for balance we do see some users praising it as well - personally I won't be taking the risk.



CCleaner is no longer suggested for use.

That depends who you are talking to - Microsoft have just added it to the Microsoft Store for Windows 10 & 11, obviously Microsoft no longer have a problem with CCleaner as it is now:



It seems that Microsoft and Piriform have apparently buried the hatchet, as CCleaner will have a new home within the Microsoft Store.

Microsoft’s Windows Defender anti-malware software had a few years back flagged the popular third-party maintenance tool as a potentially unwanted application. 

The Redmond giant seems to have had a change of heart and is no longer classifying it as a PUA.


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On 2/7/2022 at 8:19 PM, Porthos said:

Bottom line. There is no reason to use ANY registry cleaner/optimizer period. Unless you relish the possibility of reinstalling your operating system.


I agree fully.

Instead i use the program Revo Uninstaller Pro for both my Windows 10 PC and my Samsung Android. There are many good features in it like junk file cleaner,history cleaner and a forced uninstall feature for uninstall apps and programs completly. When uninstalling programs and apps manually from the controll panel,it leaves a lot of leftovers of the programs in the registry that you wish to uninstall. There is a tool in Revo Uninstaller Pro that is called Forced Uninstall that uninstalls programs and apps completly,even files and leftover folders in the registry. However,there is no such feature as a pure registry cleaner.  I would never use such.

Revo Uninstaller Pro does not contains any PUP and can be downloaded for a free trial period directly from their own website.

Edited by sten2
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  • Root Admin

There really is no reason for Revo Uninstaller Pro either. The only potential reason to use it would be if there was some program that simply would not uninstall itself at all, and was causing some type of issue.

Having leftover elements in the registry is not hurting the performance or operation of your computer. Spending time and money worrying about it is bothering your wallet and causing you needless stress.




A few recommended articles to read on registry cleaners:

Registry cleaners are not supported by Microsoft

"Microsoft cannot guarantee that problems resulting from the use of a registry cleaning utility can be solved. Issues caused by these utilities may not be repairable and lost data may not be recoverable"


In most cases regardless of which Registry Cleaning tool you use it's not going to outright break Windows from booting or running. Normally the damage done is rarely seen or even attributed to the cleaning. How it can sometimes manifest itself is with an application simply not behaving as it used to, a program feature that no longer launches. In some cases on a computer with detailed auditing enabled it can show errors that were not there prior to the cleaning, but again these are typically things that would be nearly impossible to know after the fact what caused it.

The bottom line is WHY are you cleaning the Registry? The system can typically read through the entire Registry in under a minute, but that is not how software reads, writes to the Registry. It makes a specific call to a location where it expects its configuration to be or where it needs to possibly interface with other COM objects to complete an operation and can typically make that read in milliseconds. Reading all the keys for my HKCU hive took 249 ms with a total of 21047 keys. So how is removing a dozen or a few dozen going to really help speed up my computer?

If you can show proof positive 100% that some value in the Registry is actually causing an issue then change or remove THAT entry. Not hundreds or dozens of entries because someone that has been programming for a few years now somehow feels they or their team know the Billions of possible values and every single one that is good or bad and can automate fixing it. Sorry but I call BS, no one knows every single entry and what it means let alone if it's good or bad.



Edited by AdvancedSetup
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