I'm running Zone Alarm's Internet Security Suite and I also have been getting a Win32.Backdoor.Delf.cir virus notice. There is no way to go in and exclude this in ZA. Previous versions of CCleaner run fine, it's just this latest version. I'd be happy to submit this to ZA if I knew how, but since it's just this last CC version and other AV programs are showing it as a virus also, shouldn't Piriform do an update to fix the problem? I love CCleaner and don't want to give it up!