the mac address cant be changed it is burned into each networking device and is the ID for that device on your LAN(home network). The IP address you can change type in the command box ipconfig /release then ipconfig /renew it is a good troubleshooting measure if you loose internet connection. As far as for hackers if you get some type of firewall like norton, macafee, zone alarm and an anit virus that should be good enough for a home user. You may want to check out the security part of the forums if you need a firewall/anti virus recommendation or if you want to set up some thick security, they know their stuff especially the ones with the little gold shield near their name.