I can't tell from your last reply if you'd successfully upgraded Kaspersky Internet Security (to the Win10-compatible version) before you attempted to upgrade to Win10 or after you attempted to upgrade to Win10.
If the 'firewall alert' in Notification Area ("southeast icons") concerned checking Windows Firewall settings, chances are the current install of the Kaspersky suite (whatever version) was/is not working properly. [If working properly, Kaspersky's firewall should automatically disable the Windows Firewall by default in Win10 as well as Win7.]
In any event, you're back to Win7 and I have some follow-up questions:
- What version of Kaspersky Internet Security is installed now and when does your current subscription expire?
- Is the Kaspersky firewall enabled and is the Windows Firewall disabled now?
- Is KB3124275, KB3124000, KB3124001, KB3121918, KB3109560, KB3110329, KB3108664, KB3121461, and/or KB3121212 (among others) listed in Installed Updates (not Update History) now?
- Double-checking => Is Adobe Flash Player v20.0.0.267 or higher installed now? TEST HERE USING INTERNET EXPLORER ONLY! => http://www.adobe.com/software/flash/about/