GREEN AV

Somehow one of my children have installed Green AV on my PC without telling me… And since I am NOT a fan of using something I’m not familiar with I would like to get rid of it. Up to now I have tried the usual methods..ie Control Panel, etc…. but it doesn’t show up there.. It doesn’t have an uninstaller so it just causes problems… tells me that I need to register it in order for it to work properly, otherwise it scans without my wanting it to… I just want GONE!!
I have been using successfully AVG up until this Green AV raised it’s ugly head… Any suggestions other than ReFormatting…
Thanks…