norton security vs windows 10

windows 10 install itself over my windows 7, without my consent ( I got catch with the message: if you do not advise to not do it windows 10 will install in 45 minutes, something like that).  from that moment I start to have some weird behavior from my system, i cannot receive mail, and my norton security just disapear form the toolbar.  the icon is still on the desktop but is inoperative.  

what should I do now...

 

Marco