Norton security makes my computer so slow...
I use malware bytes+windows defender only.
About cc cleaner, there are many discussions about it on the internet. It is basically a controversy software
Many people claim it does more harm than good.
https://helpdeskgeek.com/free-tools-review/why-you-shouldnt-download-ccleaner-for-windows-anymore/Also, Microsoft has never recommended running registry cleaners, nor has it developed its own, mostly because it doesnt want users messing around with the registry. Just one inadvertent mistake in deleting a registry key could potentially corrupt your entire Windows operating system.
The reality is that there are stories out there of people experiencing damage to their Windows OS by running CCleaners registry cleaner.
If its dangerous for you to manually go through the registry and edit it yourself, why would you let a third-party application go in and try to guess what registry keys are unnecessary? There is also no evidence that registry cleaners speed up Windows.
https://blog.ipswitch.com/should-you-use-a-registry-cleaner-like-ccleanerSo is CCleaner Safe to Use?
Regardless, there are some stories out there of CCleaner breaking Windows. The point is, why bother messing with the registry if those useless registry files do nothing to harm your PC performance in the first place? Running a registry cleaner is essentially a waste of time and runs the risk of only causing more problems.
Windows is designed to deal with the registry and any potential registry errors. If Microsoft felt that cleaning the registry would help your computer, they probably would have built it into Windows by now. They haven't because the registry doesn't need to be cleaned, despite what others may have told you. Registry keys do not take up enough space for us to even notice them nowadays. I actually have doubts about whether or not there was a computer performance boost from cleaning your registry 10 years ago.