How to fix CCleaner not opening Windows 10
CCleaner is a popular junk file cleaner that is capable of removing unwanted files left behind by uninstalled programs and cleaning system caches, browsing history, registry files, problematic registry keys, etc. However, many users complain that CCleaner won't open Windows 10.

After going through extensive reports and user posts, we summarize several tried and tested solutions for CCleaner that do not work on Windows 10. Now, let's explore them one by one.

Solution: Temporarily disable any third-party antivirus programs and Windows firewall
According to a survey, certain antivirus software is one of the most common reasons why Ccleaner not working won't open Windows 10. To run this program smoothly, you can temporarily disable your third-party antivirus software like Avast and even Windows Defender Call on-1-888-570-1595.