I find the registry cleaning of ccleaner quite safe, it doesn’t go very deep and it’s never taken anything it shouldn’t have from my system.
If your worried about what it may delet make a backup image first.
All registry cleaners come with a certain amount of risk, ccleaner isn’t a deep cleaning one and safer than most (but still not without risk), id does offer to backup the change and you should take advantage of that.
Hopefully some month down the road you’ll remember this decision and don’t come back here
asking for help when some of your programs no longer run… ;D
Some items don’t show up for a long time.
I have used CCleaner’s registry cleaner as long as I have used avast! and never had a problem!
I have used the backup function and never have needed to use the backup I took!