Hello, I started having the same issue just 2 days ago, after the last Microsoft antivirus defender update. My machine was working fine but after that update, when restart the system, if Kaspersky antiransomware is on, the browser is blocked till I stop Kaspersky. I added all browsers to trusted apps, like suggested @Sassy36, but still don´t work. Please any suggestion, to avoid uninstalling Kaspersky.