Restarting your router and computer is the first step you should do if you are receiving the error “Windows couldn’t determine the proxy settings of this network”. This will close all open applications and reset the proxy settings to default. For most users, this will fix the issue.
If that doesn’t work, you can try disabling any antivirus software or firewall VPN software that may be interfering with your Internet connection. You can disable each app by navigating to the settings and removing it one at a time. Once you’ve disabled all of these apps, try reconnecting to the Internet and determine if the issue is still there.
If you can’t solve the issue using any of these methods, you may want to consider a full system restore in Windows. This will restore the default network settings and also remove any other changes that could be creating the issue. This can be accomplished by clicking “Internet Options” in the Control Panel. Uncheck the boxes that say Use a proxy for your LAN and Automatically detect settings. This will only affect the current user account. If you are using a shared computer, you may need to repeat this process for other users. You can disable proxy settings using the Registry Editor. However, this method is more complex and could lead to issues in the future.