Reasons of webroot login error and how to fix it. Webroot antivirus users may sometimes experience a headache while login to their accounts. Call +1-833-283-0002 for any webroot login related problem. Webroot Critical Error occurs when we try to update any system files and there is any interruption during the update process. If you want to fix this error, you need to uninstall and reinstall the Webroot software from your system.