I was running Kaspersky Internet Security 2015.
I uninstalled it using Revo Uninstaller.
On Startup, Windows Security Center reported Firewall was off.
There was no internet access.
When I attempted to start the Firewall, I received the message:
"We're sorry. The Security Center could not turn on Windows Firewall (etc.)"
I got a screenshot of "Security Center" which had references to:
Kaspersky Anti-Virus (Uninstalled as reported using "Advanced" Scan option)
PC Cleaner Pro (Uninstalled many moons ago)
I ran Malwarebytes which reported three (03) references to "PUP" files.
I removed those files.
I installed the latest version of Norton Security
Norton reported "Downloader.Upatre" and removed it along with "reimage5repair.exe" (PUA.Gen.3)
Internet access has returned, although I had to manually reset some internet options related to connection properties so they would behave as before.
Security Center opens now with references to Norton Firewall and Norton Antivirus, but I continue to wonder whether all is OK since I don't think any of these operations actually found the cause of the strange behaviour.
Anyone have any ideas or suggestions for more investigation(s)?