well the OP was asking about conflicts between CCleaner and Avast!, so I was conveying my experience. Avast! wasn’t cleaning out the files from the temp folder, had something to do with CCleaner having hooks in them. I’m pretty sure my case was a very special and specific case and won’t be experienced by anyone else, but you never know - so I put it here for posterity.
I have had zero issues since I changed the settings on CCleaner and Avast! started working properly again. I changed all the settings back to what they were in CCleaner (when Avast! wasn’t clearing out the temp files) and Avast! is still working properly. Just something buggy happened (probably due to the virus) and things got ‘stuck’ and I got the ‘unstuck’ by changing settings. Who knows. All I know is everything’s peachy again, just wanted to add to a dead thread.
I needed to install Regcure per instructions of MBAM moderator when it crashed one day after an upgrade and even the mod. couldn’t get it going after a week of troubleshooting on one of my PC’s. It actually fixed registry errors in MBAM that we were not able to fix ourselves and resolved the problem. You may have your opinion, but I personally have a high opinion in MBAM.
I have used RegCure before but got rid of it after realizing that it was detecting very many of the same “invalid” keys every time I ran it. Keys that seemed like they were automatically recreated at every restart of the machine. It was either that or the keys never existed in the first place. It does work but I think they purposely inflate the “detection” rate to make you think it’s better than other cleaners. CCleaner has a very good registry cleaner built in and the free one offered by Auslogics is also very good and totally safe to use. Avast! has no conflicts with either one.