It might have helped if you had said which software, and which OS?
And as you seem to have a browser issue then which browser?
What antivirus are you using.
From what you have posted it could be CCleaner, CCleaner Browser, Kamo, something else?
It could be Windows, Mac, or Android.
It could be any browser.
This is a user forum, and the knowledgable users here help many others all the time.
(On a forum we can also post screenshots and maybe photos that can help work through problems)
But for anyone to be able to help you do need to provide a few details so that someone can work out what is happening.
However if you would prefer 'official' help there is a contact form here to raise a support ticket: https://support.ccleaner.com/s/contact-form?language=en_US&form=general
You will get an acknowledgement of your request, note that you will then be in a queue for them to email you a reply.
Support is there for paying customers, it's part of what you pay for, if you are not a paying customer then you will still get a reply but paying customers will get priority.
Having said all that - "Not Responding" at the top of a browser can mean a few things.
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It is often a sign that your your wifi connection has dropped out.
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Or that your broadband has dropped offline.
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Or it could be a sign that something is wrong with your browser.
My first guess would be that you are connected to wifi, and that it is frequently disconnecting.
Windows 10 can be prone to wifi dropout on some computers, it can start to happen after a Windows Update, and then stop happening following a later update.
(One of my laptops is prone to doing it, so if that is your problem I have a quick way to connect again).
If it is you wifi that is dropping out then this icon will change to a globe when it disconnects:
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