Keep getting Norton Firewall window long after deleting it from Mac (Lion)

I deleted all Norton/Symantec files after what turned out to be a phony virus scare months ago. But I continue to get a window every time I open the Mac Book Pro (Lion).

 

Meanwhile I am in Europe now & developed problems accessing wifi via Apple Mail--my settings seem to have gotten hopelessly mangled--and the Norton Firewall window keeps saying I have changed my network and it asks me my location. I have a suspicion that in some way, the hidden remains of Norton Firewall Antivirus have mucked with my settings inadvertently. Now I can only access email from the internet via an ethernet cord.

 

In any case, how do I get rid of that window and whatever hidden files are causing it to appear? I've searched my HD for any remaining Symantec, Norton, Firewall files and none come up. I have no way to do an uninstall.

 

Thank you,

kkm9