Kinda bizarre to me. Both Avast and Ccleaner are popular tools that have been around for awhile and both in use by millions, that you'd expect the find an answer to a question like this. If you call Avast support, it seems to take forever for them to understand the question..then they really have no answer and suggest (naturally) that you buy the Avast product that is another add to the suite. As for Ccleaner - I can not find an email address for support on pinform and after filling out and online inquiry, never received anything back. I'll keep trying. Thanks.