My boss gave me an old Dell Desktop (3.5 yrs old). I took my blue ethernet cable and attached the desktop to my D-Link dir 645 wireless router, and the internet went down for my entire home when it was working minutes beforehand. After some research through my phone, I was able to plug in an IP address for IPV4, which brought the internet back up for the desktop and wireless laptop. 4 questions: when I connected the blue cord, it set me up to a "network 2" with a password, but I want to be set up to the family network. How to I know I am set up to the right network? Originally I think I was using an IPv6 address so how do I get back the original settings? How do I know if I am secure or not on my network? My laptop now says that my family network is "public" when I know people have to plug in a password to join, but I didn't have to do it on the desktop. And last question, is there a way to delete an entire network and start from scratch again? We have too made gadgets and it has gotten confusing to me! Thank you!!!