Unable to delete key/string from registry

Here is a problem that I have been struggling with all evening and I need some help please.:cry: I deleted Zone Alarm Extreme Security using Revo Uninstaller, I managed to get rid of everything bar a folder containing 1 dll file (in Program Files (64) and its registry settings. CCleaner and Revo cannot remove them, I have tried manually but I get a big folder saying I need permission from...