I have using CCleaner Pro for 2 years with this same A/V and firewall. I have changed nothing but the update of your program. If you must know I am using the latest version of Eset Internet Security. It has had no bearing on CCleaner before I updated your product, so now I really do not think that's the issue. I tried disconnecting from the internet, and it did not help at all. I have tried uninstalling and reinstalling an older version of CCleaner which did work. So unless you can help me, I really hope you can, my license is coming up for renewal and if I don't have answer, I will certainly not renew. I will check back fior an answer tomorrow, Thank you for your assistance. I always using health check and custom clean. Both. I like to rid my computer of cookies everyday.