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They are ALL safe to remove - otherwise CC would not have listed them.
As to whether removing them causes any side-effects, that's the million dollar question isn't it!
CC is one of the 'friendlier' registry cleaners and as an extra safety net, it provides an opportunity to backup the registry before cleaning, which I strongly suggest you do. But over-riding all that, there is hardly any benefit from cleaning the registry: it gives almost no performance improvement unless the registry is mega-bloated with redundant keys.
Doing it more frequently than yearly I would deem as overkill.
Registry cleaning always has the caveat of User Beware.
But to answer your specific example, I would have no hesitation in trusting CC to remove all those entries, doing the offered backup first.
If you still have AVG 2014 antivirus installed I personally wouldn't let it touch it, I never let a registry cleaner mess with my installed antivirus, anti-malware, security software in general. I would instead right-click those AVG 2014 entries shown in the list and Exclude them.
Be sure and let CCleaner make the registry backup, and save it for a while . . . 'till you're sure nothing will go blooey.
Sorry to belabor the obvious, but some folks don't do that.
They are ALL safe to remove - otherwise CC would not have listed them.As to whether removing them causes any side-effects, that's the million dollar question isn't it!
First statement untrue, because safe in this context means "cause side-effects".
Please follow the advice in my signature regarding registry cleaning