Changing the default password on your router is essential for network security. Default passwords can be easily obtained and exploited by attackers to gain unauthorized access. Your own unique, strong password helps protect against such intrusions by making it more difficult for potential intruders to access your network. Keeping the default password is a significant security risk, and relying only on antivirus software for protection doesn't secure the router itself. Installing updates is a good practice but does not directly address the issue of the default password. Writing down the password does not enhance security; it can actually pose a risk if the written record is easily accessible to others.