Glad to hear things are working.
Your practice of a clean system reinstallation, after uninstalling an antivirus and before installing a new one, is very good! My computer would be in better shape if I did like you do.
However, when you are just reinstalling the same software again, you don't need to do that. Just uninstall, reboot, and reinstall.
In this case, as it turns out, reinstallation was not the solution anyways. Harlan, who is our Kaspersky guru on this forum, gave you the right solution.