Just to be clear, could I ask you are you advising that I use both the UPHCleaner (to correct errors?) and the CC cleaner (to clean the registry?)?
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avastconspiracy,
I don't mean to introduce more confusion, and of course you are free to choose whatever tool you want to run. I just thought that you can hear a different perspective on the "cleaners" issue.
Some users use some or all those "cleaners". I myself use CCleaner for some specific goal.
But you can find many reports of "some" cleaner making more trouble than good, and for each user that "some" will be different.
So what you can also find are recommendations just in the opposite direction of some of those you found here in this topic. That "opposite" recommendation would be: do NOT run any "cleaner" unless you have a specific problem and you know exactly what to do with the "cleaner" so to solve that problem.
Since your original problem was resolved by running the uninstall tools of your previous antivirus and by running the Setup tool of Avast, then you don't currently need to clean any specific object.
So my point is that running any of those cleaners "could" potentially be good, but the risk of unwillingly making "bad" is certainly there, in any one of those so called "cleaners", specially when you don't have the knowledge to differentiate one specific item (to be clean) from the other (which can give you more headaches).
As I said, this is just a different perspective.