nukecad

Defender doesn't usually block CCleaner, and from what you say it seems not to have installed at all which is odd. As trium says it's worth trying the 'Slim' installer, third one down here: https://www.ccleaner.com/ccleaner/builds It installs the same CCleaner but does it slightly differently, (it doesn't try to contact certain servers), so can often work where the 'Standard' installer gets hung up. Another tip that sometimes works for problem installs is to disconnect from the internet before installing CCleaner. (Again, if you are not on the internet it doesn't try to reach any servers). Some other tips for overcoming install problems have been collected here: https://community.ccleaner.com/topic/5739-solution-when-ccleaner-wont-install-or-download-windows/

Could you tell us which antivirus you are using?

From what you say it sounds as if you have it ticked to wipe free space everytime you run CCleaner and then interrupt it to save time? I'd untick the 'Wipe Free Space' in the Custom Clean options so that it doesn't run at all - and you don't have to interupt it. It's not something that you need to do unless your are selling or passing on the computer/drive to someone else. You wipe the free space so that the new owner can't use recovery software to see the contents of your old deleted files. That's it's only function, it doesn't speed up your computer in anyway or free up any space.

When CCleaner suddenly stops working and then just as suddenly starts again it's often because an antivirus definition starts to wrongly block it and then another AV definition update a day or two later corrects that block. We see that happen most often when a new CCleaner version is released and the AV company takes a while to update their definitions for the new version. Some AV's are more prone to it than others. As CCleaner Version 5.80 was released on Tuesday and you coudn't open it on Wednesday I suspect that is what happened here, ie your CCleaner updated and then your antivirus wouldn't let the new version run until the AV definitions got updated to recognise the new version.

CCleaner doesn't keep a cache, the updater checks each time what version Windows says is on your machine and compares that to what is listed as the latest on the server database. My CCleaner reports Irfanview as up to date at 4.58 Is yours still reporting it wrongly?

Ah, it's the old issue of WFS being interrupted by something before it has finished, and so leaving the ZZZ files behind. (Maybe that could be improved so that it cleans them up as it goes along rather than just at the end?) @JonathanG How often do you run WFS or Drive Wiper, and have you noticed it not completing? If you run Wipe Free Space again, one pass and let it complete, it may (should) remove those ZZZ files. Or, probably quicker, you can delete the folders manually.

I've flagged your question for staff attention, But if Youtube is blocking downloads then Youtube is blocking downloads. And as said above downloading from Youtube is against their terms and conditions, so they will block downloaders if/when they can. Youtube, and the music industry, takes legal action against products that allow downloading, of copywrited material, from Youtube. I don't know if that has happened here but it may have. Does it still work to download from sites other than Youtube? If you go to another site with (legally) downloadable video content does the button appear again? (I don't have the browser installed to try myself). From the CCleaner documentation: https://www.ccleaner.com/docs/ccleaner-browser/ccleaner-browser-tools

It is not clear just what it is that you are wanting to do, please explain what you mean. Není jasné, co přesně chcete dělat, vysvětlete prosím, co máte na mysli.

Try Restarting the computer. Note: not a shutdown/reboot - click "Restart".

@Andrei CCleaner I belive that the question is why CCleaner Secure Delete etc. leaves these files/filenames behind and doesn't remove them as standard? Which TBH is a good question.

Simply go to Options>Updates and tick the relevant box.

This often happens with a new software version. Especially something like CCleaner which can clean 'controlled' folders. Give Windows Security CFA a day or so to catch up that there is a new version of CCleaner so the number has changed.

If you have CCleaner Free version then you can set it to launch (ie. run a clean) when you start your computer. Options>Settings>'Launch the CCleaner app...........' With CCleaner Professional version for Window (not the free version) there is a task scheduler that you can set to run CCleaner daily, weekly, or monthly and specificy days/times to run. Here's an example of the weekly settings options: I've not used CCleaner on Android for a while but there is a similar option shown on the Playstore page: https://play.google.com/store/apps/details?id=com.piriform.ccleaner&referrer=utm_source=piriform_android&utm_medium=playstorelink&utm_campaign=ccleaner-android

I would note that Win 7 is EOL now - so nothing is going to be changing the registy - so nothing will be found. (Unless you get Win 7 malware from somewhere)

Those are cached JavaScript files that get put there as you are browsing webpages, so that the cached js can be used to open the page slightly more quickly if/when you go back to it. https://www.zdnet.com/article/these-hidden-cache-files-are-bloating-your-google-chrome/ It should be safe make that Chrome 'Code Cache\js\' an Include in CCleaner to regularly clear it out. And an include for he same in Edge Chromium as well which I assume is a different path? Whether they should be added to CCleaner as standard is a question for the development team. (PS. I wouldn't be at all surprised if these caches are already cleared if you use the winapp2.ini).

The intention of wiping the free space is to make previously deleted files unrecoverable by standard file recovery software. Wiping just the MFT would not do that. The MFT is simply a list of where the data for a particular file is on the disk, so wiping it just wipes that list and the file data itself may still be recoverable. If you just wipe freespace without wiping the MFT then the filenames may still be recovered from the MFT but the data that was in those files can't be recovered. If you just wipe the MFT then you won't be able to recover the filenames but could still recover the file data itself. Wiping the MFT is an additional option so that as well as wiping the file data itself the list of where that data used to be, and what the file used to be called, also gets wiped. PS. Wiping the freespace has no function other that 'sanitising' a disc so that deleted files can't later be recovered from it. Unless you are selling or otherwise passing the disc/computer on to someone else wiping the free space is not needed.

It can be fast if there is nothing to find, but instantly seems a bit quick. (But if you have a SSD as your system drive it could be very quick). You could try reinstalling CCleaner? We recommend not to regularly use the Registry Cleaner with Windows 10. Windows 10 changes the registry often which can give false results. See this: https://community.ccleaner.com/topic/59952-i-get-a-registry-error-on-ccleaner-on-windows-10-i-have-scanned-5-times/?tab=comments#comment-326804 Here is Microsofts stance on using any Registry Cleaner: "Microsoft does not support the use of registry cleaners." https://support.microsoft.com/en-gb/help/2563254/microsoft-support-policy-for-the-use-of-registry-cleaning-utilities

Youtube has been making more changes recently. The ads situation will be a change that Youtube made to push advertising, it will take blockers time to catch up. Presumably your downloader is/was a browser add-on? There is no official downloader in Youtube, that's because downloading is against their terms and conditions for copyright reasons. YouTube is constantly changing its source code. Many downloader add-ons don't keep up with those changes which means they may stop working suddenly. You could try installing a different downloader add-on.

Revo Uninstaller is also good at getting rid of remnants left over by an uninstall. The paid for version (or the trial) can search for and remove remnants from things you uninstalled before you even got Revo. (With the free version you can do it by reinstalling the app and then using Revo Free to uninstall it again and remove the remnants).

I suspect that most of what you are seeing are system files and application files that do need to be duplicated for things to work properly. You can tell Duplicate Finder to ignore system files which should exclude most of what you are seeing, but it may still show duplicates of application files. The other duplicate finder is probably already set to ignore the system files which is why it's not showing any. You are best using the ADD button to specify what location to look in and what filetypes to look for. Typically that would be things like .doc, .png, .mp4, etc. files - things that you have put there yourself. So if you think you may have duplicates of a photograph for instance you would tell it to look for .jpg files (or whatever format you save your photos in). It only lets you delete one entry at once for safety, plus of course CCleaner can't know which one of a duplicate to keep - only you can decide that. If you could delete everything at once then you could really mess your computer up by deleting needed system file duplicates.

No problem. It does sound as if your disk may have an issue though. I'd advise to do a search for the Windows commands 'ChkDsk', 'DISM and 'SFC' which run in a command window to check out the disk and fix errors. They are a more advanced thing to use but very useful to know about if you are having disk issues. Andavari gives a bit more info on how to use the basic options here: https://community.ccleaner.com/topic/60460-ccleaner-does-not-empty-my-recycle-bin-even-is-checked/?tab=comments#comment-329104

Thanks, it is known. CCleaner does clear it but Windows puts it straight back, it's part of Windows 10 21H1 & 21H2 and is loaded onto your computer by Windows. Just ignore it. This is one reason why we advise against running the Registry Cleaner on Win 10 unless you have a specific registry problem - Win 10 changes the registry much more frequently than older Windows did. https://community.ccleaner.com/topic/59952-i-get-a-registry-error-on-ccleaner-on-windows-10-i-have-scanned-5-times/?tab=comments#comment-326804

TBH we don't advise using the Registry Cleaner with Windows 10 (unless you are trying to fix a specific problem). https://community.ccleaner.com/topic/59952-i-get-a-registry-error-on-ccleaner-on-windows-10-i-have-scanned-5-times/?tab=comments#comment-326804 CCleaner is now at v5.79. Is there a particular reason why you haven't updated. If I do run the reg cleaner analyse it rarely finds anything. I take that as a sign that I'm doing things right and so there is nothing anomalous to find. The odd entries it does find are usually something that changed in a Windows 10 update and should be left alone anyway. SpeechRuntime being a recent example - if you clear it from the registry then Windows will put it straight back.

It shouldn't do any harm to the HDD. Optimise should work on both SDDs and HDDs. But it is a bit different to an old style defrag. Things change. If you noticed Windows built in defragging app is now called "Defragment and optimise drives" - or similar depending on your Windows 10 version. But yes just use the 'Stop' button and wait for it to finish what it's working on and then stop doing any more PS. Disk usage will almost always be at 100% access when defragging/optimising. If you want to do something else that needs disk access then it's not a problem as the defragger will stop using 100% until it can again.

Well if Health Check respected exclusions/inclusions, etc. then it would just be Custom Clean, Startup, and Softerware Updater all launched from one button. So then it would be pretty meaningless to have it seperate. (Health Check being meaningless bloat - Now where have I heard that before?). You can hide Health Check from view, it's just a change to a few registry entries and has been discussed before on the forum. I won't repeat it here because I don't encourage people to mess about in the registry, I'll PM you. (And I believe that it has to be redone every update as well, because the update will put the reg entries back?)