I have not updated zonealarm for some time because this happened after I updated somwhere around v 55.094.000. Sure enough when I decided to update again today (some months later), each time I set ZA to run at startup it then disables itself for next startup. So, I know it was not to do with a buggy version update. I will try a clean install again but I did this last time and it didn't work either which is why I gave up. I am running Adaware with adwatch, MS anti-spyware and ESET NOD32 all of which I stop before the new instalation. I have installed same version of ZA on laptop and that starts up okay each time so it's something about config on my desktop. In terms of software I have different virus scanners - NOD32 ESET on desktop where I am getting the problem and AVG on the laptop where I am not. Otherwise a lot of the same software. Is there more to do to properly shut down programs than disabling in system tray before installing/upgrading? Anyone heard of ESET NOD32 causing this somehow? Can I set the run at startup value directly in the registry to see if that does it? If so could someone direct me to the correct key? Can anyone shed any light?