Something to know is that the term PUA stands for 'Potentialy Unwanted Application'.
The thing that you should take note of there is the word- Potentially.
(It means 'might be').
That is someones personal opinion that they might not want that app - but whether it is 'Unwanted' or not is up to you not them.
Occasionally someone decides to try and force their personal opinion on others, even some Microsoft employees do it now and again. (They should know better and get pulled up when they do).
But it's your choice if something is unwanted or not.
Some people want things, other people don't want them.
So:
Updating your driver(s) caused you a problem, that is not unknown. (And sometimes not unusual).
Updating Drivers can result is problems, but that is because the updated driver is not the right one for your machine.
(Personally I would not use any Driver Updater, I would decide first if it needs to be updated and if it does then update it myself - but again that is <em>my</em> choice).
PUA's (and PUM's - Potentialy Unwanted Modifications) should be treated as just alerts/warnings from your security app that you may want to take a closer look at what something may be doing.
It's then up to you to decide if you want to keep using it or not.
Millions of people around the world use CCleaner, they don't consider it a 'Unwanted' Application.
Some do consider it unwanted, but they shouldn't be trying to force that opinion on everyone else.
(As an example Facebook is unwanted by me, but I wouldn't try to tell anybody else that they shouldn't use it. That's their choice if they want it or not).
Now having said all that:
The 'PiriformBundler' that is being objected to <u>is not in CCleaner itself.</u>
It is a component of the Standard Installer for CCleaner, (CCsetup###.exe) and it will only run when you install CCleaner from the Standard Installer.
It is the page that comes up offering an additional software.
That page has very big 'Decline' and 'Accept' buttons.
It will only run, and you will only see it, when you are installing CCleaner.