I am having a similar experience with ccleaner browser in Win10. I did not want to install it, but missed the check box when I was updating my CCleaner app. I've tried using the Control Panel and Apps & features to uninstall the browser. Didn't work. I've also tried the CCleanerBrowserUninstall.exe located in C:\Program Files (x86)\CCleaner Browser. That didn't work either. All three methods above did nothing. I'm super frustrated...