I've used the free version of CCleaner for years. After most recent update I didn't unclick the "install Avast" button in time and ended up with Avast installed on my computer. Didn't want it so I uninstalled it with IObit Unistaller, which supposedly will clean up all traces. A week later I still have quite a few Avast files in various places that I am unable to get rid of because my computer tells me they are "in use". I wish for only one thing: T that I could get rid of all the Avast files that even a good uninstaller cannot touch. This is just a rant......
