cleanerlover

I am running the latest version of CCleaner and when I run the cleaner function it reports 640 MB of files to be deleted. However, when I instruct it to remove the files it only removes say 360 MB. I then run the cleaner function again and it reported 0 MB for removal. This never happened with previous versions of CCleaner. The only new software I am using is Norton Internet Security 2008. Has anyone experienced this and if so what can you do about it?