hazelnut

More info please. Freezes where?

You really should only use one antivirus. Is your AV up to date ?

So you are running 2 antivirus at the same time? Can I ask why? Did you download the free CCleaner version? Use the SLIM version from here (bottom in the list) https://www.ccleaner.com/ccleaner/builds

Need more info. What operating system. Which anti-virus. Did you update from a previous version.

See here https://community.ccleaner.com/topic/56848-piriform-translator-webservice-closed/?tab=comments#comment-315214

Can I just ask to make sure that when you select those cookies you are then sending them across to the ''cookies to keep'' list by highlighting one, and clicking on the right-arrow in the middle of the page to send it over to the 'cookies to keep' list (and then same with the other 2 ones you mention.) Pictures here https://www.ccleaner.com/docs/ccleaner/ccleaner-settings/choosing-which-cookies-to-keep

I have passed this on to admins.

I cannot see CCleaner mentioned in your screenshot. It mentions 'some security software' CCleaner is NOT security software. What antivirus do you use and what other security software do you use e.g Malwarebytes.

What message did Firefox give you?

That was going to be my next suggestion

Does the same thing happen if you use a DVD instead of a USB ? (just trying some ideas)

Open CCleaner. Select Options. Select Updates. Select perform updates manually.

You report on this has been sent to admins by one of the other mods.

What anti-virus are you using? Which operating system (Windows 10?) Can you download it from here? (You can just enter your key to make it into paid version.) https://www.ccleaner.com/ccleaner/builds

You need to go here https://support.emsisoft.com/forum/83-help-my-files-are-encrypted/ or here https://www.bleepingcomputer.com/forums/f/239/ransomware-help-tech-support/