Getting update notice for windows 10 on my windows 7pro pc

I've got a windows 7pro pc running Norton internet security.  I keep getting this popup window that says "Install an updated version of your Norton Product for Windows 10-Your current version of Norton Internet Security Online is not compatible with windows 10, click to download a new version and stay protected"   Now since I have a windows 7 pc I click to ignore the message, it then unloads the antivirus software and won't allow me to reopen it.  I've done 2 complete removal/reinstalls and get the same thing every time.  I even select the next button to install the update and it just doesn't do anything.  Any ideas how to fix this, other than upgrading to windows 10?  Which I do not want to do.

Lisa