Vlk is fully correct (as usual). But I can’t imagine that avast! did not warn you about the presence of NAV… :frowning:
Vlk, maybe the changes in the last versions to disable my ‘second’ warning of the SystemWorks presence did this :-\

Sorensenjeppe, do not install more than one antivirus program (resident). Norton never gets out of the registry… unless a lot of work can be done… But be happy, I´m here because I get rid from Norton, after Vlk and Kubecj precious help, lot of lost hours… The main reason installation fails or systems freeze when using new AV programs is the inablility of the old ones to uninstall properly. I have had to dig up removal tools for Norton before anything would operate properly. This is not an avast issue, Kaspersky, McAfee and even Grisoft (e-mail plugin) have their own unique uninstall issues as well.

No doubt, avast! is quite better than NAV (of course, when properly installed) :wink: