Found this on the forums.
"Registry cleaners are useless and destroy Windows OS's components".
Whether ccleaner is the cause of your problems or not, i don't know.But there maybe something in the solutions here that will help you.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
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